GB2518112A

GB2518112A - Cartridge, process cartridge, and electrophotographic image generation device

Info

Publication number: GB2518112A
Application number: GB1500631.5A
Authority: GB
Inventors: Masaaki Sato; Masatoshi Yamashita; Satoshi Nishiya; Kazuhiko Kanno
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2012-06-15
Filing date: 2013-06-14
Publication date: 2015-03-11
Anticipated expiration: 2033-06-14
Also published as: CL2018000159A1; MX2022003103A; BR112014031215B1; EP3745215A1; BR112014031215A2; CN110426937A; TWI627516B; US20220350292A1; DE112013002931T5; CL2014003365A1; JP2017142518A; US20200125029A1; GB201500631D0; ZA201408068B; US9429877B2; ES2816752T3; SG10201704605YA; CN104541212B; AU2013275198B2; EP3242164A1

Abstract

Provided is a cartridge that can be mounted to and removed from the main body of an electrophotographic image generation device. The cartridge includes: (i) a rotatable development roller for developing a latent image generated on a photosensitive member; (ii) a first driving transfer member for receiving a rotational force generated by the main body of the device; (iii) a second driving transfer member that can be coupled with the first driving transfer member and that can transfer the rotational force received by the first driving transfer member to the development roller; and (iv) a coupling release member that includes a force receiving section that can receive force generated by the main body of the device and an impelling section that can impel at least one of the first driving transfer member and the second driving transfer member with the force received by the force receiving section so as to separate one of the first driving transfer member and the second driving transfer member from the other to release the coupling.

Description

DESCRIPTION

[TITLE OF THE INVENTION]

CARTRIDGE, PROCESS CARTRIDGE AN)

ELECTROPHOTOGRAPI-IIC IMAGE FORMING APPARATUS

[FIELD OF THE INVENTION]

100011 The present invention relates to an electrophotographic image forming apparatus (image forming apparatus) and a cartridge detachably mountable to a main assembly of the image forming apparatus.

100021 The image forming apparatus forms an image on a recording material using an electrophotographic image forming process. Examples of the image forming apparatus include an electrophotographic copying machine, an electrophotographic printer (laser beam printer, LED or printer, for example), a facsimile machine, a word processor and so on.

100031 The cartridge comprises an electrophotographic photosensitive drum as an image bearing member, and at least one of process means actable on the drum (a developer carrying member (developing roller)), which are unified into a cartridge which is detachably mountable to the image forming apparatus. The cartridge may comprise the drum and the developing roller as a unit, or may comprises the drum, or may comprises the developing roller. A cartridge which comprises the drum is a drum cartridge, and the cartridge which comprises the developing roller is a developing cartridge.

The main assembly of the image forming apparatus is portions of the image forming apparatus other than the cartridge.

[BACKOROUN) ART] 100051 In a conventional image forming apparatus, a drum and process means actable on the drum are unified into a cartridge which is detachably mountable to a main assembly of the apparatus (process cartridge type).

100061 With such a process cartridge type, maintenance operations for the image forming apparatus can be performed in effect by the user without relying on a service person, and therefore, the operationality can be remarkably improved.

100071 Therefore, the process cartridge type is widely used in the field of the image forming apparatus.

100081 A process cartridge (Japanese Laid-open Patent Application 2001- 337511), for example) and an image forming apparatus (Japanese Laid-open Patent Application 2003-208024, for example) have been proposed, in which a clutch is provided to effect switching to drive the developing roller during an image forming operation and to shut off the drive of the developing roller during a non-image-formation.

[SUMMARY OF THE INVENTION]

is [Problem to be solved by the invention] [0009] In Japanese Laid-open Patent Application 2001-337511, a spring clutch is provided at an end portion of the developing roller to switch the drive.

100101 In addition, in Japanese Laid-open Patent Application 2003-208024, a clutch is provided in the image forming apparatus to switch the drive for the developing roller.

100111 Accordingly, it is a principal object of the present invention to improve the clutch for switching the drive for the developing roller.

[Means for solving the problem] [0012] According to a first aspect of the present invention, there is provided a cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said cartridge comprising (i) a rotatable developing roller for developing a latent image formed on a photosensitive member; (ii) a first drive transmission member capable of receiving a rotational force originated by the main assembly; (iii) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmifting the rotational force received by said first drive transmission member to said developing roller; and (iv) a coupling disconnection member including (iv -i) a force receiving portion capable of receiving the force originated by the main assembly, and (iv-ii) an urging portion capable of urging at least one of said first drive transmission member and said second drive transmission member by the force received by said force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling.

100131 According to a second aspect of the present invention, there is provided an electrophotographic image forming apparatus capable of image formation on a recording material, said electrophotographic image forming apparatus is comprising: (i) a main assembly including a main assembly drive transmission member and a main assembly urging member; and cii) a cartridge detachably mountable to said main assembly, said cartridge including, (ii -i) a rotatable developing roller for developing a latent image formed on a photosensitive member; (ii -ii) a first drive transmission member capable of receiving a rotational force originated bysaid main assembly; (ii -Hi) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmitting the rotational force received by said first drive transmission member to said developing roller; and (H -iv) a coupling disconnection member including (ii-iv -i) a force receiving portion capable of receiving the force originated by the main assembly urging member, and (ii-iv-ii) an urging portion capable of urging at least one of said first drive transmission member and said second drive transmission member by the force received by said force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling.

100141 According to a third aspect of the present invention, there is provided an process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said main assembly including a main assembly drive transmission member and a main assembly urging member, said process cartridge comprising (i) rotatable photosensitive member; (ii) a rotatable developing roller for developing a latent image formed on said photosensitive member, said developing roller being movable toward and away from said photosensitive member; (Hi) an urging force receiving portion for receiving an urging force from the main assembly urging member to space said developing roller from said photosensitive member; (iv) a first drive transmission member for receiving a rotational force from the main assembly drive is transmission member; (v) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmitting the rotational force received by said first drive transmission member to said developing roller; and (vi) an urging portion capable of urging at least one of said first drive transmission member and said second drive transmission member by the force received by said urging force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling 100151 According to a fourth aspect of the present invention, there is provided an electrophotographic image fomiing apparatus capable of image formation on a recording materia', said electrophotographic image forming apparatus comprising (i) a main assembly including a spacing force urging member and a main assembly drive transmission member; and (ii) a process cartridge detachably mountable to said main assembly, said process cartridge including, (ii -i) a rotatable photosensitive member, (ii -ii) a developing roller rotatable to develop a latent image formed on said photosensitive member, said developing roller being movable toward and away from said photosensitive member, (ii -iii) a spacing force receiving portion for receiving a spacing force for spacing said developing roller from said photosensitive member, from said spacing force urging member, (ii -iv) a first drive transmission member for receiving a rotational force from the main assembly drive transmission member, (ii -v) a second drive transmission member capable of connecting with said first drive transmission member to transmit the rotational force received by said first drive transmission member to said developing roller, and (ii -vi) a coupling disconnection member capable of urging at least one of said first drive transmission member and said second drive transmission member to separate one of said first drive transmission member and said second drive transmission is member from the other to disconnect the coupling by said spacing force received by said spacing force receiving portion.

100161 According to a fifth aspect of the present invention, there is provided an process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said process cartridge comprising a photosensitive member; a photosensitive member frame rotatably supporting said photosensitive member; a developing rofler for developing a latent image formed on said photosensitive member; a developing device frame rotatably supporting said developing roller and connected with said photosensitive member frame so as to be rotatable between a contacting position in which said developing roller is contacted with said photosensitive member and a spacing position in which said developing roller is spaced from said photosensitive member; a first drive transmission member rotatable about a rotation axis about which said developing device frame is rotatable relative to said photosensitive member frame and capable of receiving a rotational force from the main assembly; a second drive transmission member rotatable about the rotation axis and capable of connecting with said first drive transmission member and transmitting the rotational force to said developing roller; and a disconnecting mechanism for disconnecting between said first drive transmission member and said second drive transmission member in accordance with rotation of the developing device frame from the contacting position to said spacing position.

100171 According to a sixth aspect of the present invention, there is provided an electrophotographic image forming apparatus for forming an image on a recording material, said electrophotographic image forming apparatus comprising (i) a main assembly including a main assembly drive transmission member for tnmsmitting a rotational force; and (ii) a process cartridge detachably mountable to said main assembly, said process cartridge including, (H -i) a photosensitive is member, (ii -ii) a photosensitive member frame for rotatably supporting said photosensitive member, (H -Hi) a developing roller, (H -iv) a developing device frame rotatably supporting said developing roller and connected with said photosensitive member frame so as to be rotatable between a contacting position in which said developing roller is contacted with said photosensitive member and a spacing position in which said developing roller is spaced from said photosensitive member, (H -v) a first drive transmission member rotatable about a rotation axis about which said developing device frame is rotatable relative to said photosensitive member frame and capable of receiving a rotational force from the main assembly drive transmission member, (ii -vi) a second drive transmission member rotatable about the rotation axis and capable of connecting with said first drive transmission member and transmitting the rotational force to said developing roller, and (H -vH) a disconnecting mechanism for disconnecting between said first drive transmission member and said second drive transmission member in accordance with rotation of the developing device frame from the contacting position to said spacing position.

[EFFECT OF THE INVENTTON] 100181 According to the present invention, the switching of the drive for the developing roller can be effected in the cartridge.

These and other objects, features and advantages of the present invention will become more apparent upon a consideration of the following description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings.

[BRIEF DESCRIPTION OF THE DRAWINGS]

100191 Figure 1 is a perspective view of a process cartridge according to a first is embodiment of the present invention, 100201 Figure 2 is a sectional view of the image forming apparatus according to the first embodiment of the present invention, 100211 Figure 3 is a perspective view of the image forming apparatus according to the first embodiment of the present invention.

100221 Figure 4 is a sectional view of the process cartridge according to the first embodiment of the present invention.

100231 Figure 5 is a perspective view of a process cartridge according to the first embodiment of the present invention.

100241 Figure 6 is a perspective view of the process cartridge according to a first embodiment of the present invention 100251 Figure 7 is a side view of the process cartridge according to the first embodiment of the present invention.

B

100261 Figure 8 is a perspective view of the process cartridge according to the first embodiment of the present invention.

100271 Figure 9 is a perspective view of the process cartridge according to the first embodiment of the present invention.

100281 Figure 10 is a perspective view of a drive connecting portion according to the first embodiment of the present invention.

100291 Figure Ilisa perspective view of the drive connecting portion having nine claws in the first embodiment of the present invention.

100301 Figure 12 is a perspective view of a modified example of the drive connecting portion according to the first embodiment of the present invention.

1003t1 Figure 13 is a sectional view of a modified example of a positioning structure for the drive connecting portion according to the first embodiment of the present invention.

100321 Figure 14 is a sectional view of the drive connecting portion according to is the first embodiment of the present invention.

100331 Figure 15 is a perspective view of a releasing member and peripheral parts thereof according to the first embodiment of the present invention.

[0034] Figure 16 is a perspective view of the releasing member and peripheral parts thereof according to the first embodiment of the present invention.

100351 Figure 17 is a perspective view in which three disconnecting cams are provided according to the first embodiment of the present invention.

100361 Figure 18 is a schematic view and a perspective view of the drive connecting portion according to the first embodiment of the present invention.

100371 Figure 19 is a schematic view and a perspective view of the drive connecting portion according to the first embodiment of the present invention.

100381 Figure 20 is a schematic view and a perspective view of the drive connecting portion according to the first embodiment of the present invention.

100391 Figure 21 is a schematic view illustrating a positional relation among the disconnecting cam, a driving side cartridge cover member and a guide for a developing device covering member.

100401 Figure 22 is a perspective view a modified example of the drive connecting portion according to the first embodiment of the present invention, as seen from the driving side.

100411 Figure 23 is a perspective view a modified example of the drive connecting portion according to the first embodiment of the present invention, as seen from a non-driving side.

100421 Figure 24 is a perspective view of the disconnecting cam and the cartridge cover member according to the first embodiment of the present invention.

100431 Figure 25 is a perspective view of the disconnecting cam and a bearing member according to the first embodiment of the present invention.

100441 Figure 26 is a perspective view of a modified example of the drive is connecting portion according to the first embodiment of the present invention.

100451 Figure 27 is a block diagram of an example of a gear arrangement of the image forming apparatus, 100461 Figure 28 is the exploded perspective view of the drive connecting portion according to a second embodiment of the present invention, as seen from a driving side.

Figure 29 is an exploded perspective view of a drive connecting portion according to the second embodiment of the present invention, as seen from a non-driving side.

100481 Figure 30 is an exploded perspective view of a process cartridge according to the second embodiment of the present invention.

100491 Figure 3] is an exploded perspective view of the process cartridge according to the second embodiment of the present invention.

100501 Figure 32 is a perspective view of a drive connecting portion according to the second embodiment of the present invention.

100511 Figure 33 is a sectional view of the drive connecting portion according to the second embodiment the present invention.

100521 Figure 34 is a perspective view of the releasing member and peripheral parts thereof according to the second embodiment of the present invention.

100531 Figure 35 is a perspective view of the releasing member and peripheral parts thereof according to the second embodiment of the present invention.

100541 Figure 36 is a schematic view and a perspective view of the drive connecting portion according to the second embodiment of the present invention.

100551 Figure 37 is a schematic view and a perspective view of the drive connecting portion according to the second embodiment of the present invention.

100561 Figure 38 is a schematic view and a perspective view of the drive connecting portion according to the second embodiment of the present invention.

[0057] Figure 39 is an exploded perspective view of a drive connecting portion according to a third embodiment the present invention, as seen from a non-driving side.

100581 Figure 40 is an exploded perspective view of the drive connecting portion according the third embodiment of the present invention as seen from a driving side.

[0059] Figure 41 is a perspective view of an image forming apparatus according to the third embodiment of the present invention.

[0060] Figure 42 is a perspective view of the drive connecting portion according to the third embodiment of the present invention.

[0061] Figure 43 is an exploded perspective view of a drive connecting portion according to a fourth embodiment of the present invention, as seen from a driving side. ii

100621 Figure 44 is an exploded perspective view of a process cartridge according to the fourth embodiment of the present invention.

100631 Figure 45 is an exploded perspective view of the process cartridge according to the fourth embodiment of the present invention.

100641 Figure 46 is an exploded perspective view of a drive connecting portion according to the fourth embodiment of the present invention as seen from a non-driving side.

100651 Figure 47 is an exploded perspective view of the drive connecting portion according to the fourth embodiment of the present invention, as seen from a a driving side.

100661 Figure 48 is a sectional view of the process cartridge according to the fourth embodiment of the present invention.

100671 Figure 49 is a perspective view of first and second coupling members according to the fourth embodiment of the present invention.

100681 Figure 50 is a sectional view of the first and second coupling members and peripheral parts thereof 100691 Figure 51 is a perspective view of a releasing member and peripheral parts thereof according to the fourth embodiment of the present invention.

100701 Figure 52 is a sectional view of a drive connecting portion according to the fourth embodiment of the present invention.

100711 Figure 53 is a perspective view of the drive connecting portion according to the fourth embodiment of the present invention.

100721 Figure 54 is a schematic view and a perspective view of the drive connecting portion according to the fourth embodiment of the present invention.

[0073] Figure 55 is a schematic view and a perspective view of the drive connecting portion according to the fourth embodiment of the present invention.

[0074] Figure 56 is a schematic view and a perspective view of the drive connecting portion according to the fourth embodiment of the present invention.

100751 Figure 57 is an exploded perspective view of the drive connecting portion according to a fifth embodiment of the present invention, as seen from a driving side.

100761 Figure 58 is an exploded perspective view of the drive connecting portion according to the fifth embodiment of the present invention, as seen from a driven side.

10077] Figure 59 is a perspective view of a second coupling member and peripheral parts thereof according to the fifth embodiment of the present invention.

100781 Figure 60 is a perspective view of first and second coupling members according to the fifth embodiment of the present invention.

100791 Figure 61 is a sectional view of a drive connecting portion according to the fifth embodiment of the present invention.

100801 Figure 62 is a schematic view and a perspective view of the drive connecting portion according to the fifth embodiment of the present invention.

100811 Figure 63 is a schematic view and a perspective view of the drive connecting portion according to the fifth embodiment of the present invention.

100821 Figure 64 is a schematic view and a pespsectional view of the drive connecting portion according to a fifth embodiment of the present invention.

100831 Figure 65 is a sectional view of a drive connecting portion according to the fifth embodiment of the present invention.

100841 Figure 66 is an exploded perspective view of a drive connecting portion according to a sixth embodiment of the present invention, as seen from a driving side.

100851 Figure 67 is an exploded perspective view of the drive connecting portion according to the sixth embodiment of the present invention, as seen from a non-driving side.

100861 Figure 68 is a perspective view of a releasing member and peripheral parts thereof according to the sixth embodiment of the present invention.

100871 Figure 69 is a perspective view of the drive connecting portion according to the sixth embodiment of the present invention.

100881 Figure 70 is a perspective view of disconnecting cam and developing device covering member according to the sixth embodiment of the present invention.

100891 Figure 71 is an exploded perspective view of a process cartridge according to the sixth embodiment of the present invention.

100901 Figure 72 is a sectional view of the drive connecting portion according to the sixth embodiment of the present invention.

1009t1 Figure 73 is a schematic view and a perspective view of the drive connecting portion according to the sixth embodiment of the present invention.

100921 Figure 74 is a schematic view and a perspective view of the drive connecting portion according to the sixth embodiment of the present invention.

[0093] Figure 75 is a schematic view and a perspective view of the drive connecting portion according to the sixth embodiment of the present invention.

100941 Figure 76 is a perspective view of a developing cartridge according the sixth embodiment of the present invention.

100951 Figure 77 is an exploded perspective view of the drive connecting portion of the developing cartridge according to the sixth embodiment of the present invention.

[0096] Figure 78 is an exploded perspective view of a drive connecting portion according to the seventh embodiment of the present invention, as seen from a driving side.

100971 Figure 79 is an exploded perspective view of the drive connecting portion according to the seventh embodiment of the present invention as seen from a non-driving side.

100981 Figure 80 is an exploded perspective view of a process cartridge according to the seventh embodiment of the present invention.

100991 Figure 81 is an exploded perspective view of a process cartridge according to the seventh embodiment of the present invention.

101001 Figure 82 is a perspective view of a releasing member and peripheral parts thereof according the seventh embodiment of the present invention.

101011 Figure 83 is a perspective view of a drive connecting portion according to the seventh embodiment of the present invention.

101021 Figure 84 is a sectional view of the drive connecting portion according to the seventh embodiment of the present invention.

101031 Figure 85 is a schematic view and a perspective view of the drive connecting portion according to the seventh embodiment of the present invention.

101041 Figure 86 is a schematic view and a perspective view of the drive connecting portion according to the seventh embodiment of the present invention.

101051 Figure 87 is a schematic view and a perspective view of the drive connecting portion according to the seventh embodiment of the present invention.

101061 Figure 88 is an exploded perspective view of a drive connecting portion of a process cartridge according to an eighth embodiment of the present invention.

101071 Figure 89 is an exploded perspective view of the drive connecting portion of the process cartridge according to the eighth embodiment of the present invention, as seen from a non-driving side.

101081 Figure 90 is an exploded perspective view of the process cartridge according to the eighth embodiment of the present invention.

101091 Figure 9] is an exploded perspective view of the process cartridge according to the eighth embodiment of the present invention.

101101 Figure 92 is a perspective view of first and second coupling members according to the eighth embodiment of the present invention.

101111 Figure 93 is a sectional view of a drive connecting portion according to the eighth embodiment of the present invention.

101121 Figure 94 is a perspective view of a releasing member and peripheral parts thereof according to the eighth embodiment of the present invention.

10113] Figure 95 is a perspective view of a drive connecting portion according to the eighth embodiment of the present invention.

10114] Figure 96 is an exploded perspective view of the process cartridge according to the eighth embodiment of the present invention.

101151 Figure 97 is a schematic view and a perspective view of the drive connecting portion according to the eighth embodiment of the present invention.

101161 Figure 98 is a schematic view and a perspective view of the drive connecting portion according to the eighth embodiment of the present invention.

10117] Figure 99 is a schematic view and a perspective view of the drive connecting portion according to the eighth embodiment of the present invention.

10118] Figure 100 is a schematic view illustrating a positional relation among a disconnecting cam, a disconnecting lever, a downstream drive transmission member and an upstream drive transmission member with respect to an axial direction.

101191 Figure 101 is an exploded view of the disconnecting cam, the disconnecting lever and the developing device covering member.

10120] Figure 102 is a sectional view of a drive connecting portion according to a ninth embodiment of the present invention.

[DESCRIPTION OF THE EMBODIMENTSJ

[Embodiment 1] [General description of the electrophotographic image forming apparatus] 101211 A first embodiment of the present invention will be described referring to the accompanying drawing.

101221 The example of the image forming apparatuses of the following embodiments is a full-color image forming apparatus to which four process cartridges are detachably mountable.

101231 The number of the process cartridges mountable to the image forming apparatus is not limited to this example. It is properly selected as desired.

101241 For example, in the case of a monochromatic image forming apparatus, the number of the process cartridges mounted to the image forming apparatus is one. The examples of the image forming apparatuses of the following embodiments are printers.

[General arrangement of the image forming apparatus] 101251 Figure 2 is a schematic section of the image forming apparatus of this is embodiment. Part (a) of Figure 3 is a perspective view of the image fonning apparatus of this embodiment. Figure 4 is a sectional view of a process cartridge P of this embodiment, FigureS is a perspective view of the process cartridge P of this embodiment as seen from a driving side, and Figure 6 is a perspective view of the process cartridge P of this embodiment as seen from a non-driving side.

101261 As shown in Figure 2, the image forming apparatus 1 is a four full-color laser beam printer using an electrophotographic image forming process for forming a color image on a recording material S. The image forming apparatus I is of a process cartridge type, in which the process cartridges are dismountably mounted to a main assembly 2 of the electrophotographic image forming apparatus to form the color image on the recording material S. 101271 Here, a side of the image forming apparatus 1 that is provided with a front door 3 is a front side, and a side opposite from the front side is a rear side.

In addition, a right side of the image forming apparatus I as seen from the front side is a driving side, and a left side is a non-driving side. Figure 2 is a sectional view of the image forming apparatus I as seen from the non-driving side, in which a front side of the sheet of the drawing is the non-driving side of the image forming apparatus 1, the right side of the sheet of the drawing is the front side of the image forming apparatus I, and the rear side of the sheet of the drawing is the driving side of the image forming apparatus 1.

101281 In the main assembly 2 of the image forming apparatus, there are ic provided process cartridges P (PY, PM, PC, PK) including a first process cartridge PY (yellow), a second process cartridge PM (magenta), a third process cartridge PC (cyan), and a fourth process cartridge PK (black), which are arnmged in the horizontal direction.

[0129] The first -fourth process cartridges P (PY, PM, PC, PlC) include similar is electrophotographic image forming process mechanisms, although the colors of the developers contained therein are different. To the first -fourth process cartridges P (PY, PM, PC, PK), rotational forces are transmitted from drive outputting portions of the main assembly 2 of the image forming apparatus.

This will be described in detail hereinafter.

[0130] In addition, the first -fourth each process cartridges P (PY, PM, PC, PK) are supplied with bias voltages (charging bias voltages, developing bias voltages and so on) (unshown), from the main assembly 2 of the image forming apparatus.

[0131] As shown in Figure 4, each of the first -fourth process cartridges P (PY, PM, PC, PlC) includes a photosensitive drum unit 8 provided with a photosensitive drum 4, a charging means and a cleaning means as process means actaNe on the drum 4. i8

101321 In addition, each of the first -fourth process cartridges P (PY, PM, PC, PK) includes a developing unit 9 provided with a developing means for developing an electrostatic latent image on the drum 4.

101331 The first process cartridge PY accommodates a yellow (Y) developer in a developing device frame 29 thereof to form a yellow color developer image on the surface of the drum 4.

101341 The second process cartridge PM accommodates a magenta (M) developer in the developing device frame 29 thereof to form a magenta color developer image on the surface of the drum 4.

101351 The third process cartridge PC accommodates a cyan (C) developer in the developing device frame 29 thereof to form a cyan color developer image on the surface of the drum 4.

101361 The fourth process cartridge PK accommodates a black (K) developer in the developing device frame 29 thereof to form a black color developer image on is the surface of the drum 4.

101371 Above the first -fourth process cartridges P (PY, PM, PC, PlC), there is provided a laser scanner unit LB as an exposure means, The laser scanner unit LB outputs a laser beam in accordance with image information. The laser beam Z is scanningly projected onto the surface of the drum 4 through an exposure window 10 ofthecartridgeP.

101381 Below the first -fourth cartridges P (PY, PM, PC, PK), there is provided an intermediary transfer belt unit 11 as a transfer member, The intermediary transfer belt unit 11 includes a driving roller 13, tension rollers 14 and 15, around which a transfer belt 12 having flexibility is extended, 101391 The drum 4 of each of the first -fourth cartridges P (PY, PM, PC, PK) contacts, at the bottom surface portion, an upper surface of the transfer belt 12.

The contact portion is a primary transfer portion. Inside the transfer belt 12, there is provided a primary transfer roller 16 opposed to the drum 4, 101401 In addition, there is provided a secondary transfer rofler 17 at a position opposed the tension roller 14 with the transfer belt 12 interposed therebetween.

The contact portion between the transfer belt 2 and the secondary transfer roller 17 is a secondary transfer portion.

101411 Below the intermediary transfer belt unit 11, a feeding unit 18 is provided. The feeding unit 18 includes a sheet feeding tray 19 accommodating a stack of recording materia's S, and a sheet feeding roller 20.

101421 Below an upper left portion in the main assembly 2 of the apparatus in ic Figure 2, a fixing unit 21 and a discharging unit 22 are provided. An upper surface of the main assembly 2 of the apparatus functions as a discharging tray 23.

101431 The recording material S having a developer image transferred thereto is subjected to a fixing operation by a fixing means provided in the fixing unit 21, and thereafter, it is discharged to the discharging tray 23.

101441 The cartidge P is detachably mountable to the main assembly 2 of the apparatus through a drawable cartridge tray 60. Part (a) of Figure 3 shows a state in which the cartridge tray 60 and the cartridges P are drawn out of the main assembly 2 of the apparatus.

[Image forming operationj 101451 Operations for forming a full-color image will be described.

101461 The drums 4 of the first -fourth cartridges P (PY, PM, PC, PK) are rotated at a predetermined speed (counterclockwise direction in Figure 2, a direction indicated by arrow D in Figure 4).

10147] The transfer belt 12 is also rotated at the speed corresponding to the speed of the drum 4 codirectionally with the rotation of the drums (the direction indicated by an arrow C in Figure 2).

101481 Also, the aser scanner unit LB is driven. In synchronism with the drive of the scanner unit LB, the surface of the drums 4 are charged by the charging rollers 5 to a predetermined polarity and potential uniformly. The laser scanner unit LB scans and exposes the surfaces of the drums 4 with the laser beams Z in accordance with the image signal off the respective colors.

101491 By this, the electrostatic latent images are formed on the surfaces of the drums 4 in accordance with the corresponding color image signal, respectively.

The electrostatic latent images are developed by the respective developing rollers 6 rotated at a predetermined speed (clockwisely in Figure 2, the direction indicated by an arrow E in Figure 4), 101501 Through such an electrophotographic image forming process operation, a yellow color developer image corresponding to the yellow component of the full-color image is formed on the drum 4 of the first cartridge PY. Then, the developer image is transferred (primary transfer) onto the transfer belt 12.

101511 Similarly, a magenta developer image corresponding to the magenta is component of the full-color image is formed on the drum 4 of the second cartridge PM. The developer image is transferred (primary transfer) superimposedly onto the yellow color developer image already transferred onto the transfer belt 12.

101521 Similarly, a cyan developer image corresponding to the cyan component of the full-color image is formed on the drum 4 of the third cartridge PC. Then, the developer image is transferred (primary transfer) superimposedly onto the yellow color and magenta color developer images already transferred onto the transfer belt 12.

101531 Similarly, a blacic developer image corresponding to the blaclc component of the full-color image is formed on the drum 4 of the fourth cartridge PK. Then, the developer image is transferred (primary transfer) superimposedly on the yellow color, magenta color and cyan color developer images already transferred onto the transfer belt 12.

101541 In this manner, a four fufl-color comprising yeHow color, magenta color, cyan color and black color is formed on the transfer belt 12 (unfixed developer image).

101551 On the other hand, a recording material S is singled out and fed at predetermined control timing. The recording material S is introduced at predetermined control timing to the secondary transfer portion which is the contact portion between the secondary transfer roller 17 and the transfer belt 12.

101561 By this, the four color superimposed developer image is all together transferred sequentially onto the surface of the recording material S from the transfer belt 12 while the recording material S is being fed to the secondary transfer portion.

[General arrangement of the process cartridge] 101571 In this embodiment, the first -fourth cartridges P (PY, PM, PC, PK) is have similar electrophotographic image forming process mechanisms, although the colors and/or the filled amounts of the developers accommodated therein are different.

101581 The cartridge P is provided with the drum 4 as the photosensitive member, and the process means actable on the drum 4, The process means includes the charging rollerS as the charging means for charging the drum 4, a developing roller 6 as the developing means for developing the latent image formed on the drum 4, a cleaning blade 7 as the cleaning means for removing a residual developer remaining on the surface of the drum 4, and so on. The cartridge P is divided into the drum unit S and the developing unit 9.

[Structure of the drum unitj 101591 As shown in Figures 4, 5 and 6, the drum unit 8 comprises the drum 4 as the photosensitive member, the charging roller 5, the cleaning blade 7, a cleaner container 26 as a photosensitive member frame, a residual developer accommodating portion 27, cartridge cover members (a cartridge cover member 24 in the driving side, and a cartridge cover member 25 in the non-driving side in Figures 5 and 6). The photosensitive member frame in a broad sense comprises the cleaner container 26 which is the photosensitive member frame in a narrow sense, and the residual developer accommodating portion 27, the driving side cartridge cover member 24, the non-driving side cartridge cover member 25 as well (this applies to the embodiments described hereinafter). When the cartridge P is mounted to the main assembly 2 of the apparatus, the photosensitive member frame is fixed to the main assembly 2 of the apparatus.

101601 The drum 4 is rotatably supported by the cartridge cover members 24 and 25 provided at the longitudinal opposite end portions of the cartridge P. Here, an axial direction of the drum 4 is the longitudinal direction.

101611 The cartridge cover members 24 and 25 are fixed to the cleaner container 26 at the opposite longitudinal end portions of the cleaner container 26.

101621 As shown in Figure 5, a coupling member 4a for transmitting a driving force to the drum 4 is provided at one longitudinal end portion of the drum 4.

Part (b) of Figure 3 is a perspective view of the main assembly 2 of the apparatus, in which the cartridge tray 60 and the cartridge P are not shown. The coupling members 4a of the cartridges P (PY, PM, PC, PK) are engaged with drum-driving-force-outputting members 61 (61Y, 61M, 61C, 61K) as main assembly side drive transmission members of the main assembly of the apparatus 2 shown in part (b) of Figure 3 so that the driving force of a driving motor (unshown) of the main assembly of the apparatus is transmitted to the drums 4.

101631 The charging rollers is supported by the cleaner container 26 and is contacted to the drum 4 so as to be driven thereby.

101641 The cleaning blade 7 is supported by the cleaner container 26 so as to be contacted to the circumferential surface of the drum 4 at a predetermined pressure.

101651 An untransferred residual developer removed from the peripheral surface of the drum 4 by the cleaning means 7 is accommodated in the residual developer accommodating portion 27 in the cleaner container 26.

101661 In addition, the driving side cartridge cover member 24 and the non-driving side cartridge cover member 25 are provided with supporting portions 24a, 25a for rotatably supporting the developing unit 9 (Figure 6).

[Structure of the developing unit] 101671 As shown in Figures 1 and 8, the developing unit 9 comprises the developing roller 6, a developing blade 31, the developing device frame 29, a bearing member 45, a developing device covering member 32 and so on. The developing device frame in a broad sense comprises the bearing member 45 and the developing device covering member 32 and so on as well as the developing device frame 29 (this applies to the embodiments which will be described is hereinafter). When the cartridge P is mounted to the main assembly 2 of the apparatus, the developing device frame 29 is movable relative to the main assembly 2 of the apparatus.

101681 The cartridge frame in a broad sense comprises the photosensitive member frame in the above-described broad sense and the developing device frame in the above-described broad sense (the same applies to the embodiments which will be described hereinafter).

101691 The developing device frame 29 includes the developer accommodating portion 49 accommodating the developer to be supplied to the developing roller 6, and the developing blade 31 for regulating a layer thickness of the developer on the peripheral surface of the developing roller 6.

101701 In addition, as shown in Figure, the bearing member 45 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 45 rotatably supports the developing roller 6. The developing roller 6 is provided with a developing roller gear 69 at a longitudinal end portion. The bearing member 45 also supports rotatably a development idler gear 36 for transmitting the driving force to the developing roller gear 69, This will be described in detail hereinafter.

101711 The developing device covering member 32 is fixed to an outside of the bearing member 45 with respect to the longitudinal direction of the cartridge P. The developing device covering member 32 covers the developing roller gear 69 and the development idler gear 36 and so on, [Assembling of the drum unit and the developing unit] 101721 Figures 5 and 6 show connection between the developing unit 9 and the drum unit 8. At one longitudinal end portion side of the cartridge P. an outside circumference 32a of a cylindrical portion 32b of the developing device covering member 32 is fitted in the supporting portion 24a of the driving side cartridge is cover member 24. In addition, at the other longitudinal end portion side of the cartridge P, a projected portion 29b projected from the developing device frame 29 is fitted in a supporting hole portion 25a of the non-driving side cartridge cover member 25. By this, the developing unit 9 is supported rotatably relative to the drum unit 8. Here, a rotational center (rotation axis) of the developing unit 9 relative to the drum unit is called "rotational center (rotation axis) X".

The rotational center X is an axis resulting the center of the supporting hole portion 24a and the center of the supporting hole portion 25a.

[Contact between the developing roller and the drum] 101731 As shown in Figures 4, 5 and 6, developing unit 9 is urged by an urging spring 95 which is an elastic member as an urging member so that the developing roller 6 is contacted to the drum 4 about the rotational center X. That is, the developing unit 9 is pressed in the direction indicated by an arrow 0 in Figure 4 by an urging force of the urging spring 95 which produces a moment in the direction indicated by an arrow H about the rotational center X. 101741 By this, the developing roller 6 is contacted to the drum 4 at a predetermined pressure. The position of the developing unit 9 relative to the drum unit 8 at this time is a contacting position. When the developing unit 9 is moved in the direction opposite the direction of the arrow G against the urging force of the urging spring 95, the developing roller 6 is spaced from the drum 4, In this manner, the developing roller 6 is movable toward and away from the drum 4.

[Spacing between the developing roller and the drum] 101751 Figure 7 is a side view of the cartridge P as seen from the driving side.

In this Figure, some parts are omitted for better illustration. When the cartridge P is mounted in the main assembly 2 of the apparatus, the drum unit 8 is positioned in place in the main assembly 2 of the apparatus.

101761 In this embodiment, a force receiving portion 45a is provided on the bearing member 45. Here, the force receiving portion 45a may be provided on another portion (developing device frame or the like, for example) other than the bearing member 45. The force receiving portion 45a as an urging force receiving portion is engageable with a main assembly spacing member 80 as a main assembly side urging member (spacing force urging member) provided in the main assembly 2 of the apparatus.

101771 The main assembly spacing member 80 as the main assembly side urging member (spacing force urging member) receives the driving force from the motor (unshown) and is movable along a rail 8] to the direction of arrows F] andF2.

101781 Part (a) of Figure 7 shows a state in which the drum 4 and the developing roller 6 are contacted with each other. At this time, the force receiving portion 45a and the main assembly spacing member 80 are spaced by a gap d.

101791 Part (b) of Figure 7 shows a state in which the main assembly spacing member 80 is away from the position in the state of the part (a) of Figure 7 in the direction of an arrow F I by a distance 6 I At this time, the force receiving portion 45a is engaged with the main assembly spacing member 80. As described in the foregoing, the developing unit 9 is rotatable relative to the drum unit 8, and therefore, in the state of part (b) of Figure 7, the developing unit 9 has rotated by an angle 0 1 in the direction of the arrow K about the rotational center X. At this time, the drum 4 and the developing roller 6 are spaced from each other by distance E 1.

101801 Part (c) of Figure 7 shows a state in which the main assembly spacing member 80 has moved in the direction of the arrow Fl from the position shown in part (a) of Figure 7 by 6 2 (>6 1). The developing unit 9 has rotated in the direction of the arrow K about the rotational center X by an angle 6 2, At this time, the drum 4 and the developing roller 6 are spaced from each other by distance F 2.

101811 The distance between the force receiving portion 45a and the rotation axis ofthe drum 4 is 13 mm -33 mm in this embodiment and in the following embodiments.

101821 The distance between the force receiving portion 45a and the rotational center Xis 27 mm -32 mm in the embodiment and in the following embodiments, [Structure of the drive connecting portion] 101831 Referring to Figures 1, 8 and 9, the structure of the drive connecting portion will be described. Here, the drive connecting portion is a mechanism for receiving the drive from the drum-driving-force-outputting member 61 of the main assembly of the apparatus 2, and transmitting or not transmitting the drive to the developing roller 6.

101841 The general arangement thereof will be described, first.

101851 Figure 9 is a perspective view of the process cartridge P as seen from the driving side, in which the driving side cartridge cover member 24 and developing device covering member 32 have been dismounted, The driving side cartridge cover member 24 is provided with an opening 24d. Through the opening 24d, the coupling member 4a provided at the end portion of the photosensitive drum 4 is exposed. As described above, the coupling member 4a is engageable with the drum-driving-force-outputting member 61 (61Y, 61M, 61C, 61K) of the main assembly 2 of the apparatus shown in part (b) of Figure 3 to receive the driving force of the driving motor (unshown) of the main assembly of the apparatus, 101861 In addition, at the end portion of the drum 4 as the photosensitive member, there is provided a drum gear 4b integral with the coupling 4a, At an end portion of the drum unit 8, there is provided a rotatable upstream drive is transmission member 37 as a first drive transmission member, and a rotatable downstream drive transmission member 38 as a second drive transmission member, A gear portion 37 g of the upstream drive transmission member 37 is engaged with the drum gear 4b. As will be described hereinafter, the drive can be transmitted from the upstream drive transmission member 37 to the downstream drive transmission member 38 when claw portions of the upstream drive transmission member 37 and the downstream drive transmission member 38 are engaged with each other, A gear portion 38 g of the downstream drive transmission member 38 as the second drive transmission member is engaged with a gear portion 36 g of the development idler gear 36 as a third drive transmission member. The gear portion of the development idler gear 36 is engaged also with the developing roller gear 69. By this, the drive transmitted to the downstream drive transmission member 38 is transmitted to the developing roller 6 through the development idler gear 36 and the developing roller gear 69.

101871 Referring to Figure 10, the structures of the upstream drive transmission member 37 and the downstream drive transmission member 38 will be described.

The upstream drive transmission member 37 comprises a claw portion 37a as an engaging portion (coupling portion), and the downstream drive transmission member 38 comprises a claw portion 38a as an engaging portion (coupling portion). The claw portion 37a and the claw portion 38a are engageable with each other. In other words, the upstream drive transmission member 37 and the downstream drive transmission member 38 are connectable with each other. In this embodiment, the claw portion 37a and the claw portion 38a each have six claws. The numbers of the claws 37a and the claws 38a are not limiting, although they are six in this embodiment. For example, Figure 11 shows an example in which the number of the claw portion 1037a of the upstream drive transmission member 1037 and the number of a claw portion 1038a are nine, is respectively. With increase of the numbers of the claws, the loads on one claw decreases, so that deformation and/or wearing of the claws can be reduced. On the other hand, given the same outer diameter, the size of the claw may decrease with increase of the number of the claws. It is desired that the number of the claws is properly selected in consideration of the load on one claw and/or the required rigidity.

101881 As shown in Figure 10, a hole portion 38m is provided at the center portion of the downstream drive transmission member 38. The hole portion 38m engages with a small diameter cylindrical portion 37m of the upstream drive transmission member 37, In other words, the cylindrical portion 37m penetrates the hole portion 38m. By doing so, the upstream drive transmission member 37 is supported by the downstream drive transmission member 38 rotatably relative thereto and slidaNy along the axis.

101891 Figure 13 shows different positioning between the upstream drive transmission member 37 and the downstream drive transmission member 38. In part (a) of Figure 13, the small diameter cylindrical portion 37m of the upstream drive transmission member 37 is directly engaged with the hole portion 38m of the downstream drive transmission member 38 shown in Figure 10 by which they are positioned relative to each other. On the other hand, in part (c) of Figure 13, the upstream drive transmission member 1237 and downstream of drive transmission member 1238 are positioned relative to each other through a shaft 44, that is, another member. More specifically, the outer peripheral portion 44d of the shaft 44 and the hole portion 1238m of the upstream drive transmission member 1237 are supported rotatably and slidably along the axis, and the outer peripheral portion 44d of the shaft 44 and the hole portion 1037s of the upstream drive transmission member 1037 are supported rotatably and slidably along the axis. By this, the downstream drive transmission member 1038 is positioned is relative to the upstream drive transmission member 1037. In the case of the structure shown in part (c) of Figure 13, the number of parts for positioning the upstream drive transmission member 1037 and the downstream drive transmission member 1038 is large, as compared with the structure shown in part (a) of Figure 13.

101901 Part (b) of Figure 13 shows a state in which the upstream drive transmission member 37 and the downstream drive transmission member 38 shown in part (a) of Figure 13 have not properly been shifted from a drive disconnected state to a drive transmission state. The drive transmission and disconnecting operation will be described hereinafter in detail. There is provided a play between the small diameter cylindrical portion 37m of the upstream drive transmission member 37 and the hole portion 38m of the downstream drive transmission member 38. In the Figure, the play is shown exaggerated for befter or and restoration for better illustration. When the upstream drive transmission member 37 and the downstream drive transmission member 38 are to be engaged with each other, they may not be engaged properly due to misalignment therebetween because of the provision of the play (part (b) of Figure 13).

101911 Similarly, part (d) of Figure 13 shows a state in which the upstream drive transmission member 1037 as the first drive transmission member and the downstream drive transmission member 1038 as the second drive transmission member shown in part (c) of Figure 13 have not properly been shifted from the drive disconnected state to the drive transmission state. The upstream drive transmission member 1037 and the downstream drive transmission member 1038 are relatively misaligned as shown in the Figure due to the number of parts and dimensional errors of them. The amount of misalignment is larger than in the structure shown in part (b) of Figure 13. In the shifting from the drive is disconnected state to the drive transmission state, if the claw portion 1037a and the claw portion 1038a of the coupling are engaged in the state of misalignment between the upstream of drive transmission member 1037 and the downstream drive transmission member 1038, the claw portion 1037a and the claw portion I 038a of the coupling may be contacted to each other only at the free end portions, as shown in part (b) or part (d) of Figure 13. In order to suppress deterioration of the rotational accuracy, the misalignment between the upstream drive transmission member 1037 and the downstream drive transmission member 1038 is desirably suppressed as much as possible. Therefore, the stmcture in which the upstream drive transmission member 37 and the downstream drive transmission member 38 are directly positioned relative to each other (the structures as shown in Figure 10 and part (a) of Figure 13) is desirable, Then, the number of parts can be reduced, and the number of assembling steps can be reduced, 101921 Part (a) of Figure 14 is a sectional view illustrating a connection state (coupling state) between the upstream drive transmission member 37 and the downstream drive transmission member 38. An inner peripheral surface 38p of the downstream drive transmission member 38 is supported rotatably and slidably along the axis by a cylindrical portion 26a of the cleaner container 26. Between the downstream drive transmission member 38 and the cleaner container 26, there is provided a spring 39 which is an elastic member as an urging member to press the downstream drive transmission member 38 in the direction indicated by an arrowM.

[0193] In the state of part (a) of Figure 14, a range of at least a part of the disconnecting cam 72 and a range of at least a part of the upstream drive transmission member 37 are overlapped with each other, when they are projected onto a phantom line parallel with a rotational axis of the developing roller 6.

is More specifically, the range of the disconnecting cam 72 is within the range of the upstream drive transmission member 37 in the projected state. With such a structure, the drive disconnecting mechanism can be downsized.

101941 In addition, in the state of part (a) of Figure 14, a range of at least a part of the disconnecting cam 72 and a range of at least a part of the downstream drive transmission member 38 are overlapped with each other, when the disconnecting cam 72 and the downstream drive transmission member 38 are projected onto a phantom line parallel with the rotational axis of the developing roller 6.

[0195] In addition, as shown in part (b) of Figure 14, the downstream drive transmission member 38 is movable in a direction of an arow N against an urging force of the spring 39. In this state, the coupling state (the state in which the rotational force transmission is capable) between the upstream drive transmission member 37 and the downstream drive transmission member 38 is not established, Even in such a state, the upstream drive transmission member 37 and the downstream drive transmission member 38 are maintained coaxial (aligned) by the direct engagement between the cylindrical portion 37m and the hole portion 38m, 101961 As described hereinbefore, the gear portion 38 g of the downstream drive transmission member 38 is engaged with the gear portion 36 g of the development idler gear 36 as the third drive transmission member, More particularly, the gear portion 38 g of the downstream drive transmission member 38 is movable in the directions of the arrows M and N while being in engagement with the gear portion 36 g of the development idler gear 36. For easy movement of the downstream drive transmission member 38 in the directions of the arrows M and N, the gear portion 36 g of the downstream drive transmission member 38 and the gear portion 36 g of the development idler gear 36 in meshing engagement therewith are desirably spur gears rather than helical gears.

101971 In the state of part (b) of Figure 14, a range of the at least a part of the upstream drive transmission member 37 and a range of at least a part of the downstream drive transmission member 38 are overlapped with each other, when the upstream drive transmission member 37 and the downstream drive transmission member 38 are projected onto a phantom line parallel with the rotational axis of the developing roller 6. In more detail, the range of the downstream drive transmission member 38 is within the range of the upstream drive transmission member 37. With such a structure, the drive disconnecting mechanism can be downsized.

101981 Suppose an axis Y is the rotational axis of the upstream drive transmission member 37 and the downstream drive transmission member 38.

As shown in part (a) of Figure 14, a contact portion 37n and a contact portion 38n where the claw portion 37a and the claw portion 38a contact with each other are inclined relative to the axis Y by an angle y 101991 More particularly, the contact portion 38n of the downstream drive transmission member 38 is overlapped with at least a part of the upstream drive transmission member 37 with respect to a direction parallel with the axis Y. In other words, the contact portion 38n overhangs a part of the downstream drive transmission member 38, and the contact portion 37n overhangs a part of the upstream drive transmission member 37, In other words, the contact portion 38n overhangs a phantom plane perpendicular to the rotational axis of the downstream drive transmission member 38, and the contact portion 37n overhangs a phantom plane perpendicular to the rotational axis of the upstream drive transmission member 37, With such a structure, in the drive transmission, the claw portion 38a and the claw portion 37a mutually pull each other in the direction of the axis Y. 102001 In the drive transmission, the drive is transmitted from the upstream is drive transmission member 37 and the downstream drive transmission member 38.

To the upstream drive transmission member 37 and the downstream drive transmission member 38, a pulling force and an urging force of the spring 39 are applied. A resultant force thereof the upstream drive transmission member 37 and the downstream drive transmission member 38 are connected with each other during the drive transmission. Here, the inclination angles y of the contact portion 37n and the contact portion 38n relative to the axis Y is preferably approx.

1° -approx. 3.5° . During the drive transmission and disconnecting operations, the contact portion 37n and the contact portion 38n are worn by sliding (the drive transmission and disconnecting operations will be described hereinafter). In addition, the claws may be deformed during the drive transmission operation. With the stmcture in which the contact portion 37n and the contact portion 38n are always mutually pulled to each other, the upstream drive transmission member 37 and the downstream drive transmission member 38 can be assuredly connected to keep the drive transmission stable, even when the wearing and/or deformation of the contact portion 37n and contact portion 38n occurs, When the upstream drive transmission member 37 and the downstream drive transmission member 38 are separated from each other due to the wearing and/or deformation of the contact portion 37n and the contact portion 38n, the urging force of the spring 39 may be made larger to assure the connection between the upstream drive transmission member 37 and the downstream drive transmission member 38. However, in this case, in the drive disconnecting operation which will be described hereinafter in which the downstream drive transmission member 38 is retracted from the upstream drive transmission member 37 against the urging force of the spring 39, the required force is large.

If the inclination angles of the contact portion 37n and the contact portion 38n relative to the axis Y is too large, the pulling force during the drive transmission is is large, and therefore, the drive transmission is stabilization, but the force required to separate the upstream drive transmission member 37 and downstream of drive transmission member 38 from each other in the drive disconnection operation is large.

102011 The number of the claws may be one, but in such a case, the downstream drive transmission member 38 andlor the upstream drive transmission member 37 is liahie to tilt relative to the axis Y due to the force applied to the claw portion during the drive transmission. If this occurs, the drive transmission property may be deteriorated (non-uniform rotation and/or poor transmission efficiency). In order to suppression such a tilting, the supporting portion rotatably supporting the upstream drive transmission member 37 and/or the downstream drive transmission member 37 may be reinforced, but it is fbrther preferable to employ a plurality of claws which are equidistantly arranged in the circumferential direction about the axis Y. When a plurality of claws are equidistantly arranged in the circumferential direction about the axis Y, a resultant force of the forces applied to the claw portions produces a moment rotating the downstream drive transmission member 38 and the upstream drive transmission member 37 about the axis Y. Therefore, the axis tilting of the downstream drive transmission member 38 and/or the upstream drive transmission member 37 relative to the axis Y can be suppressed. On the other hand, with increase of the number of claws, the size of the claws decreases with the result of decrease of the rigid of the claws even to a liability of breakage.

Therefore, in the case that the contact portion 37n and the contact portion 38n mutually pull each other at all times, the numbers of the claws of the claw portion 37a and the claws of the claw portion 38a are two -nine, respectively.

102021 In the foregoing, the contact portion 37n and the contact portion 38n mutually pull each other at all times, but this is not limiting. In other words, the contact portion 38n may not overhang a phantom plane perpendicular to the rotational axis of the downstream drive transmission member 38, and similarly, the contact portion 37n may not overhang a phantom plane perpendicular to the rotational axis of the upstream drive transmission member 37. In this case, the upstream drive transmission member 37 and the downstream drive transmission member 38 mutually repel. However, by properly adjusting the urging force of the spring 39, the engagement between the upstream drive transmission member 37 and the downstream drive transmission member 38 can be accomplished.

Nevertheless, from the standpoint of stabilized drive transmission, the above-described mutually pulling structure is preferable.

102031 In addition, the configurations of the contact portion 37n and the contact portion 38n are not limited to the clawS For example, with respect to the engagement between an upstream drive transmission member 1137 and a downstream drive transmission member 1138 as shown in Figure 12, a contact portion I l37n may have a claw configuration, and the contact portion 38n may have a rib configuration.

102041 The drive disconnecting mechanism will be described. As shown in Figures I and 8, a disconnecting cam 72 as a coupling releasing member which is a part of the disconnecting mechanism is provided between the development idler gear 36 and the developing device covering member 32. In other words, at least a part of the disconnecting cam 72 is between the development idler gear 36 and the developing device covering member 32 in a direction parallel with the rotational axis of the developing roller 6.

102051 Figure 15 is a perspective view illustrating an engaging relation between the disconnecting cam 72 and the developing device covering member 32.

102061 The disconnecting cam 72 is substantially oval and has an outer surface 72i. The developing device covering member 32 has an inner peripheral surface is 32i. The inner peripheral surface 32i is engageable with the outer peripheral surface 72i. By doing so, the disconnecting cam 72 is supported slidably relative to the developing device covering member 32. In other words, the disconnecting cam 72 is movable relative to the developing device covering member 32 substantially in parallel with the rotational axis of the developing roller 6. The outer peripheral surface 72i of the disconnecting cam 72 the inner peripheral surface 32i of the developing device covering member 32 and the outside circumference 32a of the developing device covering member 32 are co-axial with each other. That is, the rotational axes of the These members are aligned with respect to the rotation axis X of the developing unit 9 relative to the drum unit 8. Here, the alignment means that within the range of the dimensional tolerances of these parts, and this applies to the embodiment which will be described hereinafter.

102071 The developing device covering member 32 is provided with a guide 32h as a (second) guide portion, and the disconnecting cam 72 is provided with a guide groove 72h as a (second) guided portion. Here, the guide 32h of the developing device covering member 32 is engaged with the guide groove 72h of the disconnecting cam 72. Here, the guide 32h and the guide groove 72h extend in parallel with the rotational axis X. By the engagement between the guide 32h and the guide groove 72h, the disconnecting cam 72 as the coupling releasing member is slidable relative to the developing device covering member 32 only in the axial direction (the directions of arrows M and N). It is not necessary that the guide 32h or the guide groove 72 has both sides parallel with the rotational axis X, but it will suffice if the sides contacting to each other are in parallel with the rotational axis X. 102081 As shown in Figures t, 8, the bearing member 45 rotatably supports the development idler gear 36. In detail, a first shaft receiving portion 45p is (cylindrical outer surface) of the bearing member 45 rotatably supports a supported portion 36p (cylindrical inner surface) of the development idler gear 36.

102091 Furthermore, the bearing member 45 rotatably supports the developing roller 6. In more detail, the second shaft receiving portion 45q (cylindrical inner surface) of the bearing member 45 rotatably supports a shaft portion ôa of the developing roller 6.

102101 Longitudinally outside of the developing device covering member 32, the driving side cartridge cover member 24 is provided. Figure 16 shows the structures of the disconnecting cam 72, the developing device covering member 32 and the driving side cartridge cover member 24.

102111 The disconnecting cam 72 as the coupling releasing member includes a contact portion (inclined surface) 72a as a force receiving portion for receiving the force produced by main assembly 2 of the apparatus (main assembly spacing member 80). The driving side cartridge cover member 24 is provided with a contact portion (inclined surface) 24b as an operating member. Furthermore, the developing device covering member 32 is provided an opening 32]. A contact portion 72a of the disconnecting cam 72 and a contact portion 24b of the driving side cartridge cover member 24 are contactable to each other through the opening 32] of the developing device covering member 32.

10212] In the foregoing, the number of the contact portions 72a of the disconnecting cam 72 and the number of the contact portions 24b of the cartridge cover member 24 are two, but the numbers are not limiting. For example, Figure 17 shows the case in which the numbers of the respective contact portions are three.

10213] The number of the contact portions may be one, but in such a case, the disconnecting cam 72 may tilt relative to the axis X by the force applied to the contact portion upon the disconnecting operation which will be described is hereinafter. If the tilting occurs, the drive switching property such as the timing of the driving connection and the disconnecting operation may be deteriorated.

In order to suppress axis tilting, it is desired to reinforce the supporting portion (the inner peripheral surface 32i of the developing device covering member 32) slidably (along the axis of the developing roller 6) supporting the disconnecting cam 72. It is further desirable to employ a plurality of contact portions which are substantially equidistantly arranged in the circumferential direction about the axis X. In this case, a resultant force of the forces applied to the contact portion produces a moment rotating the disconnecting cam 72 about the axis X. Therefore, the axis tilting of the disconnecting cam 72 relative to the axis X can be suppressed. When three or more contact portions are provided, a flat supporting plane for the disconnecting cam 72 relative to the axis X can be defined, so that the axis tilting of the disconnecting cam 72 relative to the axis X can be further suppressed. That is, the attitude of the disconnecting cam 72 can be stabilized.

102141 As shown in Figures 1, 8, the upstream drive transmission member 37 and the downstream drive transmission member 38 are engaged with each other through an opening 72f of the disconnecting cam 72. Figure 14 is a sectional view illustrating the dispositions of the upstream drive transmission member 37, the downstream drive transmission member 38 and the disconnecting cam 72.

Through the opening 72fofthe disconnecting cam 72, the claw portions 37a and 38a of the upstream drive transmission member 37 and the downstream drive transmission member 38 are provided.

[Drive disconnecting operation] 102151 The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described, [State II 102161 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 45a of the bearing member 45 are spaced by a gap d. At this time, the developing roller 6 is in contact with the drum 4 as the photosensitive member. This state will be called "state I" of the main assembly spacing member 80. Part (a) of Figure 18 schematically shows the drive connecting portion at this time. Part (b) of Figure 18 is a perspective view of the drive connecting portion. In Figure 18, some parts are omitted for better illustration. In part(b) of Figure 18, only a part of the driving side cartridge cover member 24 including the contact portion 24b is shown, and only a part the developing device covering member 32 including the guide 32h is shown.

Between the contact portion 72a of the disconnecting cam 72 and the contact portion 24b of the cartridge cover member 24, there is a gap e. At this time, the claws 37a of the upstream drive transmission member 37 and the claws 38a of the downstream drive transmission member 38 are engaged with each other by an engagement depth q. As described above, the downstream drive transmission member 38 is engaged with the development idler gear 36 as the third drive transmission member, And, the development idler gear 36 is engaged with the developing roller gear 69. The upstream drive transmission member 37 is always in engagement with the drum gear 4b. Therefore, the driving force inputted to the coupling 4a from the main assembly 2 of the apparatus is trajismitted to the developing roller gear 69 through the upstream drive transmission member 37 and the downstream drive transmission member 38.

By this, the developing roller 6 is driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 2j 102t71 When the main assembly spacing member 80 moves in the direction is indicated by an arrow Fl by S I in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 rotates about the axis X in the direction indicated by the arrow K by an angle 0 1.

As a result, the developing roller 6 is spaced from the drum 4 by a distance 1.

The disconnecting cam 72 and the developing device covering member 32 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 0 1 in interrelation with the rotation of the developing unit 9. On the other hand, when the cartridge P is mounted to the main assembly 2 of the apparatus, the drum unit 8, the driving side cartridge cover member 24 and the non-driving side cartridge cover member 25 are positioned in place in the main assembly 2 of the apparatus. As shown in part (a) of Figure 19 and part (b) of Figure 19, the contact portion 24b of the driving side cartridge cover member 24 does not move, In the Figure, the contact portion 72a of the disconnecting cam 72 and the contact portion 24b of the driving side cartridge cover member 24 havejust started contacting to each other, as a result of rotation of the disconnecting cam 72 in the direction of the arrow IC in the Figure in interrelation with the rotation of the developing unit 9. At this time, the claw 37a of the upstream drive transmission member 37 and the claw 38a of the downstream drive transmission member 38 are kept engaging with each other (part (a) of Figure 19). Therefore, the driving force inputted to the coupling 4a from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the upstream drive transmission member 37 and the downstream drive transmission member 38. The state of these parts in this state is called a developing device spacing and drive transmission state.

[State 31 102t81 Part (a) of Figure 20 and part (b) of Figure 20 show the drive connecting portion when the main assembly spacing member 80 moves from the developing is device spacing and drive transmission state in the direction of the arrow F] only ó 2 in the Figure as shown in part (c) of Figure 7. In interrelation with the rotation of the developing unit 9 by the angle 6 2 (> 6), the disconnecting cam 72 and the developing device covering member 32 rotate. On the other hand, the driving side cartridge cover member 24 does not change its position similarly to the foregoing, but the disconnecting cam 72 rotates in the direction of the arrow K in the Figure. At this time the contact portion 72a of the disconnecting cam 72 receives a reaction force from the contact portion 24b of the driving side cartridge cover member 24. In addition, as described above, the guide groove 72h of the disconnecting cam 72 is limited by engaging with the guide 32h of the developing device covering member 32 to be movable only in the axial direction (arrows M and N) (Figure] 5). As a result, the disconnecting cam 72 slides by p in the direction of the arrow N relative to the developing device covering member.

In interrelation with the movement of the disconnecting cam 72 in the direction of the an-ow N, an urging surface 72c, as the urging portion, of the disconnecting cam 72 urges the urged surface 38c, as the portion-to-be-urged, of the downstream drive transmission member 38. By this, the downstream drive transmission member 38 slides in the direction of the an-ow N by p against the urging force of the spring 39 (Figure 20 and parts (b) of Figure 14).

102191 At this time, the movement distance p is larger than the engagement depth q between the claws 37a of the upstream drive transmission member 37 and the claws 38a of the downstream drive transmission member 38, and therefore, the claws 37a and the claws 38a are disengaged from each other. In this manner, the upstream drive transmission member 37 continues to receive the driving force (rotational force) from the main assembly 2 of the apparatus, whereas the downstream drive transmission member 38 stops. As a result, the rotation of the developing roller gear 69, and therefore, the rotation of the developing roller 6 is stop. The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

102201 In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K, With such structures, the developing roller 6 is capable of spacing from the drum 4 while rotating. As a result, the drive for the developing roller 6 can be stopped in accordance with the space distance between the developing roller 6 and the drum 4 [Drive connecting operation] 102211 Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

102221 In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 0 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 37a of the upstream drive transmission member 37 and the claws 38a of the downstream drive transmission member 38 are in a disconnected state, as shown in Figure 20.

102231 In the angle 0 1 position of the developing unit 9 (the state shown in part (b) of Figure 7 and Figure 19) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 37a of the upstream drive transmission member 37 and the claws 38a of the downstream drive transmission member 38 are engaged with each other by the movement of the downstream drive transmission member 38 by the urging force of the spring 39 in the direction of the arrow M. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller is 6, At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

102241 By further rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum 102251 The foregoing is the exphmation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow H, With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmitted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4.

102261 As described in the foregoing, according to the structures, the drive disconnection state and the drive transmission state to the developing roller 6 are determined firmly by the rotation angle of the developing unit 9, 102271 In the following description, the contact portion 72a of the disconnecting cam 72 and the contact portion 24b of the driving side cartridge cover member 24 are in face to face contact, but this is not inevitable. For example, the contact may be between a surface and a ridge line, between a surface and a point, between a ridge line and a ridge line or between a ridge line and a point.

102281 Figure 21 schematically shows a positional relation among the disconnecting cam 72, driving side cartridge cover member 24, and the guide 32h of the developing device covering member 32. Part (a) of Figure 21 shows the development contact and drive transmission state; part (b) of Figure 21 shows the developing device spacing and drive transmission state; and part (c) of Figure 21 the developing device spacing and drive disconnection state. They are the same as the states shown in Figures t8, t9, 20, respectively. In part (c) of Figure 2t, is the disconnecting cam 72 and the driving side cartridge cover member 24 contact with each other at the contact portion 72a and the contact portion 24b which are inclined relative to the rotation axis X. Here, in the developing device spacing and drive disconnection state, the disconnecting cam 72 with driving side cartridge cover member 24 may take the positional relation shown in part (d) of Figure 21. After the contacting between the contact portion 72a and the contact portion 24b which are inclined relative to the rotation axis X, as shown in part (c) of Figure 21, the developing unit 9 is further rotated, In this manner, the disconnecting cam 72 and the driving side cartridge cover member 24 contact to each other at a flat surface portion 72s and a flat surface portion 24s which are perpendicular to the rotation axis X. 102291 When a gap f exists between the guide groove 72h of the disconnecting cam 72 and the guide 32h of the developing device covering member 32 as shown in part (a) of Figure 21, the movement from the development contact and drive transmission state shown in part (a) of Figure 21 to the developing device spacing and drive disconnection state shown in part (d) of Figure 21 are the same as those explained in the foregoing. On the other hand, in the movement from the developing device spacing and drive disconnection state shown in part (d) of Figure 21 to the driving connection state shown in part (a) of Figure 21, the gap f between the guide groove 72h of the disconnecting cam 72 and the guide 32h of the developing device covering member 32 first disappears (part (e) of Figure 21).

Then, the state immediately before the contact portion 72a and the contact portion 24b are contacted to each other is reached (part (f) of Figure 21). Then, the contact portion 72a and the contact portion 24b contact to each other (part (c) of Figure 21). Subsequently, the relative positional relation between the disconnecting cam 72 and the driving side cartridge cover member 24 in the process from the spaced-developing-device-state to the contacted-developing-device-state of the developing unit 9 are the same as that described in the foregoing.

102301 When the gap f is between the guide groove 72h of the disconnecting cam 72 and the guide 32h of the developing device covering member 32 as shown in Figure 21, the disconnecting cam 72 does not move in the direction of the arrow lvi until the gap f disappears in the process from the spaced-developing-device-state to the contacted-developing-device-state. By the disconnecting cam 72 moving in the direction of the arrow lvi, the driving connection is established between the upstream drive transmission member 37 and the downstream drive transmission member 38. That is, the timing at which the disconnecting cam 72 moves in the direction of the arrow lvi and the timing of the establishment of the driving connection are synchronized with each other. In other words, the timing of the establishment of the driving connection can be controlled by the gap f between the guide groove 72h of the disconnecting cam 72 and the guide 32h of the developing device covering member 32.

102311 On the other hand, the spaced-developing-device-state of the developing unit 9 is constructed as shown in Figure 20 or part (c) of Figure 2] More particularly, the state in which the disconnecting cam 72 and the driving side cartridge cover member 24 contact with each other at the contact portion 72a and the contact portion 24b which are inclined relative to the rotation axis Xis the developing device spacing and drive disconnection. In this case, the timing of the movement of the disconnecting cam 72 in the direction of the arrow M is independent of the gap f between the guide groove 72h of the disconnecting cam 72 and the guide 32h of the developing device covering member 32. That is, the timing of the driving connection establishment can be controlled with high precision. In addition, movement distances of the disconnecting cam 72 in the directions of the arrows lvi, N can reduction so that the size of the process is cartridge with respect to the axial direction can be reduced.

102321 Figure 22 to Figure 25 show a modified example of this embodiment. In the above-described embodiment, in the switching of the drive, the downstream drive transmission member 1338 as the second drive transmission member moves in the axial directions, namely the directions of the arrows Ni and N. In the example of Figure 22 from Figure 25, the upstream drive transmission member 1337 as the first drive transmission member moves in the axial direction namely the directions of the arrows M and N, in the drive switching. Figure 22 and Figure 23 are a perspective view of the process cartridge as seen from the driving side and a perspective view as seen from the non-driving side, respectively.

Between the upstream drive transmission member 1337 and the driving side cartridge cover member 1324, a spring] 339 is provided so as to urge the upstream drive transmission member 1337 in the direction of the arrow N. 102331 Figure 24 is a perspective view illustrating an engaging relation between a disconnecting cam 1372 as the coupling releasing member and the driving side cartridge cover member 1324. The driving side cartridge cover member 1324 is provided with a guide 1324k as the second guide portion, and the disconnecting cam 1372 is provided with a guided portion 1372k as the second guided portion.

The guide 1324k of the driving side cartridge cover member 1324 is engaged with the guided portion 1372k of the disconnecting cam 372. By this, the disconnecting cam 1372 is slidable only in the axial direction (arrow lvi and N directions) relative to the driving side cartridge cover member 1324.

102341 Figure 25 shows structures of the disconnecting cam 1372 and a bearing member 1345. The disconnecting cam 1372 has a contact portion (inclined surface) 1372a the force receiving portion. In addition, the bearing member 1345 is provided with a contact portion (inclined surface) 1345b as the operating member. The contact portion 1372a of the disconnecting cam 1372 and the contact portion I 343b of the bearing member 1345 are contactable to each other.

102351 As shown in Figures 22 and 23, the upstream drive transmission member 1337 and the downstream drive transmission member 1338 are engaged with each other through an opening 13 72f of the disconnecting cam 1372.

102361 The description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 contacted with each other are being spaced from each other. The disconnecting cam 1372 is movable (slidable) only in the axial direction (directions of arrows M and N) similarly to the foregoing. By contact between the contact portion 1372a of the disconnecting cam 372 and the contact portion 1345b of the bearing member 1345, the disconnecting cam 1372 move in the direction of the arrow lvi. In interrelation with the movement of the disconnecting cam 1372 in the direction of the arrow M, an urging surface 1372c of the disconnecting cam 1372 as the urging portion urges an urged surface 1337c of the upstream drive transmission member 1337 functioning as a portion-to-be-urged (Figures 22 and 23). By this, the upstream drive transmission member 1337 moves in the direction of the arrow lvi against the urging force of the spring 1339. This disengages the upstream drive transmission member 1337 and the downstream drive transmission member 1338 from each other.

102371 On the other hand, the operation when the developing roller 6 and the drum 4 spaced from each other are contacted to each other is opposite the above-described operation. The structure in which the upstream drive transmission member 1337 moves in the axial direction (arrows NI and N) upon the switching of the drive as shown in Figure 22 to Figure 25, is also implementable.

102381 It will suffice if the upstream drive transmission member 37 or the downstream drive transmission member 38 moves in the axial direction upon the switching of the drive, In addition, both of the upstream drive transmission is member 37 and the downstream drive transmission member 38 may be spaced from each other along the axial direction. The drive switching is effected at least by the change of the relative position between the upstream drive transmission member 37 and the downstream drive transmission member 38 in the axial direction.

102391 In the above-described structure, the center portion hole portion 38m of the downstream drive transmission member 38 is engaged with the small diameter cylindrical portion 37m of the upstream drive transmission member 37, but the engagement between the downstream drive transmission member 38 and the upstream drive transmission member 37 is not limited to such an example.

For example, as shown in Figure 26, it may be that the downstream drive transmission member 1438 as the second drive transmission member is provided with a small diameter cylindrical portion 1438t at the center portion, and the upstream drive transmission member 1437 as the first drive transmission member is provided with a hole portion 1437t at the center portion, in which the cylindrical portion 1438t and the hole portion 1437t are engaged.

102401 In the following description, the contact portion 72a of the disconnecting cam 72 and the contact portion 24b of the driving side cartridge cover member 24 are in face to face contact, but this is not inevitable. For example, the contact may be between a surface and a ridge line, between a surface and a point, between a ridge line and a ridge line or between a ridge line and a point.

[Difference from the conventional examplel 102411 Differences from the conventional structure will be described.

102421 In Japanese Laid-open Patent Application 2001-337511, a coupling for receiving the drive from the main assembly of the image forming apparatus and a spring clutch for switching the drive are provided at the end portion of the is developing roller, In addition, a link interrelated with the rotation of the developing unit is provided in the process cartridge. When the developing roller is spaced from the dmm by the rotation of the developing unit, the link operates a spring clutch provided at the end portion of the developing roller to stop the drive of the developing roller.

102431 The spring clutch per se involves variations, More particularly, a time lug tends to occur from the actuation of the spring clutch to the actual stop of the drive transmission, Furthermore, dimension variations of the link mechanism and the variations of the rotation angle of the developing unit may vary the timing at which the linic mechanism operates the spring clutch, The link mechanism for operating the spring clutch is away from the rotational center between the developing unit and the drum unit, 102441 On the contrary, according to this embodiment, drive transmission to the developing roller is switched by the structure including the contact portion 72a of the disconnecting cam 72, the contact portion 24b as the operating portion, for operating it, of the driving side cartridge cover member 24, the contact portion (inclined surface) 72a of the disconnecting cam 72 and the contact portion the inclined surface) 24b) of the driving side cartridge cover member 24, a control variation in the rotation time of the developing roller can be reduced.

102451 In addition, the structures of the clutch is coaxial with the rotational center about which the developing unit is rotatable relative to the drum unit.

Here, the rotational center is the position where the relative position error between the drum unit and the developing unit is the least. By providing the clutch for switching the drive transmission to the developing roller at the rotational center, the clutch switching timing relative to the rotation angle of the developing unit can be controlled with highest precision. As a result, the rotation time of the developing roller can be controlled with high precision, and is therefore, the deteriorations of the developer and/or the developing roller can be suppressed.

102461 In some conventional examples of the image forming apparatus using the process cartridge, the clutch for effecting the drive switching for the developing roller is provided in the image forming apparatus.

102471 When a monochromatic printing is carried out in a full-color image forming apparatus, for example, the drive to the developing device for non-black colors is stopped using an clutch, In addition, when the electrostatic latent images on the drum are developed by the developing device also in the monochromatic image forming apparatus, the drive is transmitted to the developing devices, and when the developing operation is not carried out, the drive to the developing devices can be stopped, by an operation of the clutch.

By stopping a drive to the developing device during the non-image-formation period, the rotation time of the developing roller can be suppressed, and therefore, the deterioration of the developer and/or the developing roller can be suppressed.

102481 As compared with the case in which the clutch for switching the drive for the developing roller is provided in the image forming apparatus, the S provision of the clutch in the process cartridge can downsize the clutch, Figure 27 is a block diagram of an example of a gear arrangement in the image forming apparatus, for transmission of the drive to the process cartridge from the motor (driving source) provided in the image forming apparatus. When the drive is transmitted to the process cartridge P (PK) from the motor 83, it is effected ic through an idler gear 84 (K), a clutch 85 (K) and an idler gear 86 (K). When the drive is transmitted to the process cartridge P (PY, PM, PC) from the motor 83, it is effected through an idler gear 84 (YJYIC), a clutch 85 (YTv1C) and idler gears 86 (YMC). The drive of the motor 83 is branched to the idler gear 84 (K) and the idler gear 84 (Yv1C), in addition, the drive from the clutch 85 (YTvIC) is branched to the idler gear 86 (Y), the idler gear 86 (Nil) and the idler gear 86 (C).

102491 For example, when a monochromatic printing is carried out by the full-color image forming apparatus, the drives to the developing devices containing the developers other than the black color developer are stopped using the clutch (YMC). In the case of the full-color printing, the drives of the motor 83 are transmitted to the process cartridges P through the clutches 85 (YMC). At this time, the load for driving the process cartridge P is concentrated on the clutch 85 (YMC). The load to the clutch 85 (K) is three time the load on the clutch 85 (YTvIC). In addition, the load variations of the color developing devices apply to one clutch 85 (YMC), similarly. In order to transmit the drive without deteriorating the rotational accuracy of the developing roller even when the load is concentrated and the load variations occur, it is desirable to enhance the rigidity of the clutch. Therefore, the clutch may be upsized, and/or a high stiffness material such as sintered metal may be used. When the clutch is provided in the process cartridge, the load and/or the load variations applied on each clutch is only the load and/or the load variation of the associated developing device. Therefore, as compared with the described example, it is unnecessary that the rigid is enhanced, and each clutch can be downsized.

10250] In the gear arrangement for drive transmission to the black color process cartridge P (PK) shown in Figure 27, it is desired to reduce the load applied to the clutch 85 (K) as much as possible. In the gear arrangement for the drive transmission to the process cartridge P, the closer to the process cartridge P (driven member), the lower the load applied to the gear shaft, taking into account the drive transmission efficiency of the gear. Therefore, the clutch for the drive switching can be downsized by providing the clutch in the cartridge, as compared with providing the clutch in the main assembly of the image forming apparatus.

The clutch may be provided on the inner peripheral surface of the gear engaging is with the developing roller gear, or the clutch is provided at a longitudinal end portion of the developing device frame 29, as will be described with respect to Embodiments 2 and et seqq., so that the clutch can be disposed in the process cartridge while suppressing the increase of the longitudinal size of the process cartridge.

[Embodiment 2] 102511 The cartridge according to a second embodiment of the present invention will be described. In the description of this embodiment, the detailed description of the portions having the same structures as in the first embodiment will be omitted.

[Structure of developing unit] 102521 As shown in Figures 28 and 29, the developing unit 9 comprises the developing roller 6, a developing blade 31, the developing device frame 29, a bearing member 45, a developing device covering member 32 and so on.

102531 In addition, as shown in Figure 28, the bearing member 45 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 45 also rotatably supports a downstream drive transmission member 71 as a second drive transmission member. The downstream drive transmission member 7] transmits a driving force to a developing roller gear 69 as a third drive transmission member. This will be described in detail hereinafter.

[Structure of the drive connecting portionj ic 102541 Referring to Figures 28, 29, 30 and 31, the structure of the drive connecting portion will be described.

102551 The general arrangement thereof will be described, first.

102561 Figure 30 is a perspective view of a process cartridge P as seen from a driving side, and Figure 31 is a perspective view of the process cartridge P as seen from a non-driving side, As shown in Figure 3], a driving side cartridge cover member 224 is provided with cylindrical bosses 224h1, 224h2, 224h3 and 224h4. The bosses 224h1, 224h2, 224h3 and 224h4 rotatably and slidably support a first idler gear 51, a second idler gear 52, a third idler gear 53 and an upstream drive transmission member 37 as a first drive transmission member, respectively. The first idler gearS! is engaged with a drum gear 4b provided at the end portion of the photosensitive drum4. The first idler gear 51 and the second idler gear 52, the second idler gear 52 and the third idler gear 53, and the third idler gear 53 and the upstream drive transmission member 37 are meshing engagement, respectively.

102571 As shown in Figure 28, between the bearing member 45 with driving side cartridge cover member 224, a spring 70 is an elastic member as an urging member, the downstream drive transmission member 71 as the second drive transmission member, a disconnecting cam 272 as a coupling releasing member which is a part of a disconnecting mechanism, and the developing device covering member 32 are provided in the order named in the direction from the bearing member 45 toward the driving side cartridge cover member 224. They will be described in detail, 10258] A claw portion 37a of the upstream drive transmission member 37 and a claw portion 71 a of the downstream drive transmission member TI can be engaged with each other through an opening 32d of the developing device covering member 32, When These claw portions are engaged with each other, a drive can be transmitted from the upstream drive transmission member 37 to the downstream drive transmission member 7t.

10259] Referring to Figure 32, the structures of the upstream drive transmission member 37 and the downstream drive transmission member 71 will be described.

The upstream drive transmission member 37 comprises a claw portion 37a as an engaging portion (coupling portion), and the downstream drive transmission member 71 comprises a claw portion 71a as an engaging portion (coupling portion), The claw portion 37a and the claw portion 71 a are engageable with each other. In other words, the upstream drive transmission member 37 and the downstream drive transmission member 71 are connectable with each other, In addition, the downstream drive transmission member 7 t is provided with a hole portion 71m at the center portion. The hole portion 71m engages with a small diameter cylindrical portion 37m of the upstream drive transmission member 37, By doing so, the upstream drive transmission member 37 is slidable (rotatable and slidable) along respective axes relative to the downstream drive transmission member 71.

10260] In addition, as shown in Figure 28, a gear portion 7] g of the downstream drive transmission member 71 is engaged also with the dev&oping roller gear 69 By this, the drive transmitted to the downstream drive transmission member 71 is transmitted to the developing roller 6 through the developing roller gear 69. Between the bearing member 45 and the downstream drive transmission member 7], the spring 70 as an elastic member as the urging member is provided. The spring 70 urges the downstream drive transmission member 71 in the direction of an arrow NI.

102611 Part (a) of Figure 33 is a sectional view illustrating a connection state between the upstream drive transmission member 37 and the downstream drive traiismission member 71, The first shaft receiving portion 45p of the bearing member 45 (cylindrical outer surface) as a first guide portion rotatably supports a supported portion 7ip (cylindrical inner surface), as a first guided portion, of the downstream drive transmission member 71. In the state that the supported portion 7tp (cylindrical inner surface) is engaged with the first shaft receiving portion 45p (cylindrical outer surface), the downstream drive transmission is member 71 is movable along a rotation axis (rotational center) X. In other words, the bearing member 45 supports is downstream drive transmission member 71 slidably along the rotation axis. Further, in other words, the downstream drive transmission member 71 is slidable (reciprocable) in the directions of arrows M and N relative to the bearing member 45, Part (a) of Figure 33 is sectional views of the related parts, part (b) of Figure 33 shows the state in which the downstream drive transmission member 71 has moved relative to the bearing member 45 in the direction of the arrow N from the position shown in part (a) of Figure 33. The downstream drive transmission member 71 is movable in the directions of arrows M and N in engagement with the developing roller gear 69. In order to make easier the movement of the downstream drive transmission member 71 in the directions of arrows Nil and N, the gear portion 71g of the downstream drive transmission member 71 is preferably a spur gear rather than a helical gear.

102621 The drive disconnecting mechanism in this embodiment will be described. As shown in Figure 28 and Figure 29, between the downstream drive transmission member 71 and the developing device covering member 32, the disconnecting cam 272 as a disconnecting member which is a part of the disconnecting mechanism is provided. Figure 34 is a perspective view illustrating an engaging relation between the disconnecting cam 272 and the developing device covering member 32.

102631 The disconnecting cam 272 has a ring portion 272j having a substantial ring configuration and an outer peripheral surface 272i as a projected portion.

The outer peripheral surface 272i projects from the ring portion 272] in the direction perpendicular to a phantom plane including the ring portion 272j (projects in parallel with the rotational axis X). The developing device covering member 32 has an inner peripheral surface 32i, The inner peripheral surface 32i is engageable with the outer peripheral surface 272i, By this, the disconnecting cam 272 is slidable relative to the developing device covering member 32 (slidable along the axis of the developing roller 6). The outer peripheral surface 272i of the disconnecting cam 272 the inner peripheral surface 32i of the developing device covering member 32 and the outside circumference 32a of the developing device covering member 32 are co-axial with each other. That is, the rotational axes of these members are aligned with respect to the rotation axis X of the developing unit 9 relative to the drum unit 8.

102641 In addition, in this embodiment, the rotational axes of the upstream drive transmission member 37 and the downstream drive transmission member 71 are also coaxial with the rotation axis X of the developing unit 9 relative to the drum unit8, 102651 The developing device covering member 32 is provided with a guide 32h as a (second) guide portion, and the disconnecting cam 272 is provided with a guide groove 272h as a (second) guided portion. Here, the guide 32h and the guide groove 272h extend in parallel with the rotation axis X. Here, the guide 32h of the developing device covering member 32 is engaged with the guide S groove 272h of the disconnecting cam 272, By the engagement between the guide 32h and the guide groove 272h, the disconnecting cam 272 is slidable relative to the developing device covering member 32 only in the axial direction (arrows fYI and N).

102661 Longitudinally outside of the developing device covering member 32, the driving side cartridge cover member 224 is provided. Figure 35 shows structures of the disconnecting cam 272, the developing device covering member 32 and the driving side cartridge cover member 224.

102671 The disconnecting cam 272 as the coupling releasing member is provided with a contact portion (inclined surface) 272a as a force receiving portion. The driving side cartridge cover member 224 is provided with a contact portion (inclined surface) 224b as an operating member. Furthermore, the developing device covering member 32 is provided an opening 323. A contact portion 272a of the disconnecting cam 272 and a contact portion 224b of the driving side cartridge cover member 224 are contactable to each other through the opening 32] of the developing device covering member 32.

102681 [drive disconnecting operation] 102691 The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described, [State 11 102701 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 45a of the bearing member 45 are spaced by a gap d, At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state F' of the main assembly spacing member 80. As shown in Figure 7, as seen in the direction along the axis of the developing roller, the force receiving portion (spacing force receiving portion) 45a projects at a position in a side substantially opposite from the rotational axis X with respect to the developing roller 6. Part (a) of Figure 36 schematically shows the drive connecting portion at this time. Part (b) of Figure 36 is a perspective view of the drive connecting portion. In Figure 36, some parts are omitted for better illustration. In addition, in part (a) of Figure 36, a pair of the upstream drive transmission member 37 and the downstream drive transmission member 71, and a pair of the disconnecting cam 272 and the driving side cartridge cover member 224 are separately shown. In part (b) of Figure 36, only a part of the driving side cartridge cover member 224 including the contact portion 224b is shown, and only a part the developing device covering member 32 including the guide is 32h is shown. Between the contact portion 272a of the disconnecting cam 272 and the contact portion 224b as the operating portion of the driving side cartridge cover member 224, there is a gap e, At this time, the claws 37a of the upstream drive transmission member 37 and the claws 7la of the downstream drive transmission member 7] are engaged with each other by an engagement depth q.

As described above, the downstream drive transmission member 7 t is engaged with the developing roller gear 69 (Figure 28). Therefore, the driving force supplied from the main assembly 2 of the apparatus to the coupling member 4a provided at the end portion of the photosensitive drum 4 is transmitted to the developing roller gear 69 through the first idler gear 5], the second idler gear 52, the third idler gear 53, the upstream drive transmission member 37 and the downstream drive transmission member 71. By this, the developing roller 6 is driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 21 102711 When the main assembly spacing member 80 moves in the direction indicated by an arrow Fl by S I in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 rotates about the axis X in the direction of an arrow K by and angle 6 1. As a result, the developing roller 6 is spaced from the drum 4 by a distance F 1. The disconnecting cam 272 and the developing device covering member 32 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 0 ic 1 in interrelation with the rotation of the developing unit 9. On the other hand, when the cartridge P is mounted to the main assembly 2 of the apparatus, the drum unit 8, the driving side cartridge cover member 224 and the non-driving side cartridge cover member 25 are positioned in place in the main assembly 2 of the apparatus. As shown in part (a) of Figure 37 and part (b) of Figure 37, the contact portion 224b of the driving side cartridge cover member 224 does not move. In the Figure, the disconnecting cam 272 rotates in the direction of the anow K in the Figure in interrelation with the rotation of the developing unit 9 the contact portion 272a of the disconnecting cam 272 and the contact portion 224b of the driving side cartridge cover member 224 start to contact to each other.

At this time, the claw 37a of the upstream drive transmission member 37 and the claw 71 a of the downstream drive transmission member 71 are kept engaging with each other (part (a) of Figure 37). The driving force supplied from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the upstream drive transmission member 37, the downstream drive transmission member 71 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state.

[State 31 102721 Part (a) of Figure 38 and part (b) of Figure 38 show the drive connecting portion when the 80 moves from the developing device spacing and drive transmission state in the direction of the arrow Fl only 5 2 in the Figure as shown in part (c) of Figure 7, In interrelation with the rotation of the developing unit 9 by the angle 0 2 (>0 1), the disconnecting cam 272 and/or the developing device covering member 32 rotate. On the other hand, the driving side cartridge cover member 224 does not change its position similarly to the foregoing, but the disconnecting cam 272 rotates in the direction of the arrow K in the Figure. At this time the contact portion 272a of the disconnecting cam 272 receives a reaction force from the contact portion 224b of the driving side cartridge cover member 224. In addition, as described above, the guide groove 272h of the disconnecting cam 272 is limited by engaging with the guide 32h of the developing device covering member 32 to be movable only in the axial direction (arrows lvi and N) (Figure 34). Therefore, as a result, the disconnecting cam is 272 slides in the direction of the arrow N by a movement distance p. In interrelation with the movement of the disconnecting cam 272 in the direction of the arrow N, an urging surface 272c, as the urging portion, of the disconnecting cam 272 urges the urged surface 71c, as the portion-to-be-urged, of the downstream drive transmission member 71. By this, the downstream drive transmission member 71 slides in the direction of the arrow N by p against the urging force of the spring 70 (parts (b) Figure 38 and Figure 33).

102731 At this time, the movement distance p is larger than the engagement depth q between the claws 37a of the upstream drive transmission member 37 and the claws 71 a of the downstream drive transmission member 7], and therefore, the claws 37a and the claws 71a are disengaged from each other. Then, since the upstream drive transmission member 37 receives the driving force from the main assembly 2 of the apparatus, it continues to rotate, and on the other hand, the downstream drive transmission member 71 stops. As a result, the rotation of the developing rofler gear 69, and therefore, the rotation of the developing roller 6 stop. The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

102741 In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 can space from the drum 4 while rotating, so that the drive to the developing roller 6 can be stopped in accordance with the spacing distance between the developing roller 6 andthedrum4.

[Drive connecting operationj 102751 Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the is operation from the above-described development contact state to the spaced-developing-device-state.

102761 In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 6 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 37a of the upstream drive transmission member 37 and the claws 71a of the downstream drive transmission member 71 are in a disconnected state, as shown in Figure 38.

102771 In the angle 0 1 position of the developing unit 9 (the state shown in part (b) of Figure 7 and Figure 37) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 37a of the upstream drive transmission member 37 and the claws 71a of the downstream drive transmission member 71 are engaged with each other by moving in the direction of an arrow NI by the urging force of the spring 70. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

102781 By fbrther rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum 4.

102791 The foregoing is the explanation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow H. With such structures, the developing roller 6 is brought into contact to the dmm 4 while rotating, and the drive can be transmitted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4.

102801 Also in this embodiment, the clutch for switching the drive transmission to the developing roller (the contact portion 272a of the disconnecting cam 272 is and the contact portion 224b as the operating portion of the driving side cartridge cover member 224) is coaxial with the rotational center of the rotation of the developing unit including the developing roller relative to the drum unit, Here, the rotational center is the position where the relative position error between the drum unit and the developing unit is the least, By providing the clutch for switching the drive transmission to the developing roller at the rotational center, the clutch switching timing relative to the rotation angle of the developing unit can be controlled with highest precision. As a result, the rotation time of the developing roller can be controlled with high precision, and therefore, the deteriorations of the developer and/or the developing roller can be suppressed.

[Embodiment 3] 102811 A cartridge according to a third embodiment of the invention will be described. In the description of this embodiment, the detailed description of the portions having the same structures as in the first and second embodiments will be omitted.

102821 Figure 39 and Figure 40 are perspective views of a cartridge of the third embodiment. Figure 41 shows an image forming apparatus 1 used with the cartridge of this embodiment. A coupling member 4a is provided at an end portion of a photosensitive drum 4 and is engageable with a drum-driving-force-outputting member 61 (61Y, 61M, 61C, 61K) of a main assembly 2 of the apparatus shown in Figure 41 to receive the driving force of a driving motor (unshown) of the main assembly of the apparatus. In addition, an Oldham coupling (upstream member 41) is provided at a driving side end portion of a developing unit 9 and is engageable with a developing device-drive output member 62 (62Y, 62M, 62C, 62K) as a main assembly side drive transmission member of the main assembly 2 shown in Figure 41 to transmit the driving force is from the driving motor (unshown) provided in the main assembly 2 of the apparatus.

[Structure of the drive connecting portion] 102831 Referring to Figures 39 and 40, the structure of the drive connecting portion will be described.

102841 The general arrangement thereof will be described, first.

102851 A driving side cartridge cover member 324 is provided with an opening 324d and an opening 324e. Through the opening 324d, the coupling member 4a provided at the end portion of the photosensitive drum 4 is exposed, and through the opening 324e, the Oldham coupling upstream member 41 provided at the end portion of the developing unit 9 is exposed. As described above, the coupling member 4a engages with the drum-driving-force-outputting member 61(61 Y, 61M, 61C, 61K) of the main assembly 2 of the apparatus shown in part (b) of Figure 41, and the Oldham coupling upstream member 41 engages with the developing device-drive output member 62 (62Y, 62M, 62C, 62K) to receives the driving force of the driving motor (unshown) of the main assembly of the apparatus.

102861 Between a bearing member 45 and the driving side cartridge cover member 324, there are provided and arranged in the direction from the bearing member 45 to the driving side cartridge cover member 324, a spring 70 which is an elastic member as an urging member, a downstream drive transmission member 71 as a second drive transmission member, a disconnecting cam 272 as a disconnecting member which is a part of a disconnecting mechanism, an upstream drive transmission member 74 as a downstream member of the Oldham coupling which is a first drive transmission member, a developing device covering member 332, an intermediary member 42 of the Oldham coupling and an upstream member 41 of the Oldham coupling. Is upstream drive is transmission member 74 is slidably supported by developing device covering member 332 and the downstream drive transmission member 71 at the opposite end portions with respect to the axial direction. In more detail, a shaft receiving portion 332e of the developing device covering member 332 slidably (rotatably) supports a supported portion 74r of the upstream drive transmission member 74, and a central hole portion 71m of the downstream drive transmission member 71 slidably (rotatable and slidable along the axis) a small diameter cylindrical portion 74m of the upstream drive transmission member 74, 102871 Figure 42 shows structures of the upstream drive transmission member (first drive transmission member) 74 and the downstream drive transmission member (second drive transmission member) 71. In Figure 42, the disconnecting cam 272 between the upstream drive transmission member 74 and the downstream drive transmission member 71 is omitted.

102881 The downstream drive transmission member 71 is provided with a claw portion 7la as an engaging portion (coupling portion), and the upstream drive transmission member 74 is provided with a claw portion 74a as an engaging portion (coupling portion). The claw portion 7] a and the claw portion 74a are engageable with each other. That is, the downstream drive transmission member 71 is connectable with the upstream drive transmission member 74.

102891 An engaging relation between the downstream drive transmission member 71 and the upstream drive transmission member 74 in this embodiment is similar to the engaging relation between the upstream drive transmission member 37 and the downstream drive transmission member 71 in Embodiment 2 (Figure 32). Furthermore, the engaging relation (Figure 34) between the disconnecting cam 272 and the developing device covering member 332, and the engaging relation (Figure 35) among the disconnecting cam 272, the developing device covering member 332 and the driving side cartridge cover member 324 are also similar to the engaging relation in Embodiment 2, 102901 In this embodiment, at least the disconnecting cam 272 is coaxial with the rotation axis X of the developing unit 9 relative to the drum unit 8, On the other hand, in Figures 39 and 40, the Oldham coupling upstream member 41 for receiving the driving force by engagement with the developing device-drive output member 62 (62Y, 62M, 62C, 62K) of the main assembly 2 of the apparatus is disposed at a position different from the rotation axis X of the developing unit 9 relative to the drum unit 8, Here, a rotation axis of the Oldham coupling upstream member 41 is Z. 102911 Even when the positional change of the developing unit 9 between the development contact state and the spaced-developing-device-state, it is required to assuredly transmit the driving force supplied from the main assembly 2 of the apparatus to the developing roller 6 through the downstream drive transmission member 71 arid the upstream drive transmission member 74. In this embodiment, the rotation axis X of the developing unit 9 relative to the drum unit 8 is not coaxial with the rotation axis Z of the Oldham upstream drive transmission member 41. Therefore, when the positional change of the developing unit 9 occurs between the development contact state and the spaced-developing-device-state, the relative position between the Oldham upstream drive transmission member 41 and the developing roller gear 69 as the third drive transmission member changes. In view of this, a universal joint (the Oldham coupling) is provided to accomplish the drive transmission even when the relative positional deviation occurs between the upstream drive transmission member 41 and the developing roller gear 69, More specifically, in this embodiment, the Oldham upstream drive transmission member 41, the Oldham coupling middle member 42 and the upstream drive transmission member 74 (three parts) 102921 The drive transmission and drive disconnecting mechanism at the time when the developing unit 9 changes between the development contact drive transmission state and the developing device spacing drive disconnection state are similar to the those in Embodiment 2. That is, the disconnecting cam 272 co-axial with the rotation axis X of the developing unit 9 moves in the longitudinal directions (directions of arrows M and N) in response to the contacting and spacing operation of the developing unit 9. By this, the driving connection and disconnection can accomplished between the downstream drive transmission member 71 and the upstream drive transmission member 74. In the case of this embodiment, the rotation axis of the developing device-drive output member 62 driven by the main assembly 2 of the apparatus is different from the rotation axis X of the developing unit 9. However, the contact portion 272a of the disconnecting cam 272 for disconnecting the driving connection, and the contact portion 324b as the operating portion of the driving side cartridge cover member 324 acting on the contact portion 272a are co-axiaHy with the rotation axis X of the developing unit 9. Therefore, the drive switching timing can be controlled with high accuracy.

102931 In this embodiment and the following embodiments, the constituent parts can be assemNed unidirectionally, that is, the direction of the arrow M in the Figure).

[Embodiment 4] ic 102941 A cartridge according to a fourth embodiment of the invention will be described. In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted.

[Structure of the developing unit] 102951 As shown in Figure 43 and 4, a developing unit 9 comprises a developing roller 6, a developing blade 3, developing device frame 29, a bearing member 45, a developing device covering member 432 and so on.

102961 The developing device frame 29 includes the developer accommodating portion 49 accommodating the developer to be supplied to the developing roller 6, and the developing blade 31 for regulating a layer thickness of the developer on the peripheral surface of the developing roller 6.

102971 In addition, as shown in Figure 43, the bearing member 45 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 45 rotatably supports the developing roller 6. The developing roller 6 is provided with a developing roller gear 69 at a longitudinal end portion. The bearing member 45 rotatably supports a downstream drive transmission member 71 for transmitting the driving force to the developing roller gear 69 as well This will be described in detail hereinafter.

102981 The developing device covering member 432 is fixed to an outside of the bearing member 45 with respect to the longitudinal direction of the cartridge P. The developing device covering member 432 covers the developing roller gear 69, the downstream drive transmission member (second drive transmission member) 71, and the upstream drive transmission member (first drive transmission member) 474 as the development input coupling. As shown in Figures 43 and 44, the developing device covering member 432 is provided with a cylindrical portion 432b. Through an inside opening 432d of the cylindrical portion 432b, a drive inputting portion 474b as a rotational force receiving portion, of an upstream drive transmission member 474 is exposed. The drive inputting portion 474b is provided at one end portion of the upstream drive transmission member 474 with respect to the axial direction, whereas a shaft portion 474m is provided at the other end portion of the drive transmission member 474, In addition, a coupling portion 474a is provided between the drive inputting portion 474b and the shaft portion 474m with respect to the direction substantially parallel with the rotational axis X of the upstream drive transmission member 474 (Figure 49). The coupling portion 474a is remoter from the rotational axis X than the shaft portion 474m in a radial direction of the upstream drive transmission member 474.

102991 When the cartridge P (PY, PM, PC, PK) is mounted in the main assembly 2 of the apparatus, the drive inputting portion 474b is engaged with a developing device-drive output member 62 (62Y, 62M, 62C, 62K) shown in part (b) of Figure 3 to transmit the driving force from the driving motor (unshown) provided in the main assembly 2 of the apparatus. The driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller gear 69 as a third drive transmission member and to the developing roller 6 through the downstream drive transmission member 71 That is, the driving force from the main assembly of the apparatus 2 can be transmitted to the dev&oping roller through the upstream drive transmission member 474 and the downstream drive transmission member 71 [Assembling of the drum unit and the developing unit] Figures 44, 45 show the disassembled developing unit 9 and the drum unit 8. At one longitudinal end portion side of the cartridge P, an outside circumference 432a of the cylindrical portion 432b of the developing device covering member 432 is rotatably engaged with a supporting portion 424a of the ic driving side cartridge cover member 424. In addition, at the other longitudinal end portion side of the cartridge P, a projected portion 29b projected from the developing device frame 29 is rotatably engaged with a supporting hole portion 25a of a non-driving side cartridge cover member 25. By this, the developing unit 9 is supported rotatably relative to the drum unit 8. Here, a rotational center is (rotation axis) of the developing unit 9 relative to the drum unit is called "rotational center (rotation axis) X'. The rotational center Xis an axis resulting the center of the supporting hole portion 424a and the center of the supporting hole portion 25a.

[Contact between the developing roller and the drum] 103011 As shown in Figures 4, 44 and 45, developing unit 9 is urged by an urging spring 95 which is an elastic member as an urging member so that the developing roller 6 is contacted to the drum 4 about the rotational center X. That is, the developing unit 9 is pressed in the direction indicated by an arrow G in Figure 4 by an urging force of the urging spring 95 which produces a moment in the direction indicated by an arrow H about the rotational center X. 103021 In addition, in Figure 43, the upstream drive transmission member 474 receives a rotation in the direction of an arrow J from the developing device-drive output member 62 is an main assembly coupling provided in the main assembly 2 of the apparatus shown in part (b) of Figure 3. Then, the downstream drive transmission member 71 is rotated in the direction of the arrow J by the driving force inputted to the upstream drive transmission member 474, By this, the developing roller gear 69 engaged with the downstream drive transmission member 71 rotates in the direction of an arrow E. By this, the developing roller 6 rotates in the direction of the arrow E. The driving force required to rotate the developing roller 6 is inputted to the upstream drive transmission member 474, by which the developing unit 9 receives a rotation moment in the direction of the arrow H. 103031 By an urging force of the above-described urging spring 95 and the rotational force supplied from the main assembly 2 of the apparatus, the developing unit 9 receives a moment in the direction of the arrow H about the rotational center X. By this, the developing roller 6 can contacted to the drum 4 is at a predetenriined pressure. The position of the developing unit 9 relative to the drum unit 8 at this time is a contacting position. In this embodiment, in order to urge the developing roller 6 to the drum 4, two forces, namely, the urging force by the urging spring 95, and the rotational force from the main assembly 2 of the apparatus are used. However, but this is not inevitable, and the developing roller 6 may be urged to the drum 4 one of such forces.

[Spacing between the developing roller and the drum] 103041 Figure 7 is a side view of the cartridge P as seen from the driving side.

In this Figure, some parts are omitted for better illustration. When the cartridge P is mounted to the main assembly 2 of the apparatus, the drum unit 8 is fixedly positioned relative to the main assembly 2 of the apparatus.

[0305] The bearing member 43 is provided with a force receiving portion 43a.

The force receiving portion 45a is engageable with a main assembly spacing member 80 provided in the main assembly 2 of the apparatus.

103061 The main assembly spacing member 80 receives the driving force from the motor (unshown) to move in the directions of an arrow Fl and F2 along a rail 81.

103071 Part (a) of Figure 7 shows a state in which the drum 4 and the developing roller 6 are contacted with each other. At this time, the force receiving portion 45a and the main assembly spacing member 80 are spaced by a gap d.

103081 Part (b) of Figure 7 shows a state in which the main assembly spacing member 80 is away from the position in the state of the part (a) of Figure 7 in the direction of an arrow F I by a distance 6 1, At this time, the force receiving portion 45a is engaged with the main assembly spacing member 80. As described in the foregoing, the developing unit 9 is rotatable relative to the drum unit 8, and therefore, in the state of part (b) of Figure 7, the developing unit 9 has is rotated by an angle 6 1 in the direction of the arrow K about the rotational center X. At this time, the drum 4 and the developing roller 6 are spaced from each otherbydistance & 1.

Part (c) of Figure 7 shows a state in which the main assembly spacing member 80 has moved in the direction of the arrow El from the position shown in part (a) of Figure 7 by 6 2 (>6 1). The developing unit 9 has rotated in the direction of the arrow K about the rotational center X by an angle 6 2. At this time, the drum 4 and the developing roller 6 are spaced from each other by distance 2.

[Structure of the drive connecting portioni 103101 Referring to Figures 43 and 46, the structure of the drive connecting portion will be described, Here, the drive connecting portion is a mechanism for receiving the drive from the developing device-drive output member 62 of the main assembly of the apparatus 2, and transmifting or stopping the drive to the developing roller 6.

[03t t] The general arrangement thereof will be described, first, 103121 Between the bearing member 45 and the driving side cartridge cover member 424, there are provided a spring 70 which is an elastic portion as the urging member, a downstream drive transmission member 71 as a second coupling member, a disconnecting cam 272 as a disconnecting member which is a part of a disconnecting mechanism, an upstream drive transmission member 474 as a first coupling member, and the developing device covering member 432, in the order named in the direction from the bearing member 45 to the driving side cartridge cover member 424. These members are co-axial with the upstream drive transmission member 474. That is, the rotational axes of the These members are aligned with the rotational axis of the upstream drive transmission member 474. Here, here, the alignment means that within the range of the dimensional tolerances of these parts, and this applies to the embodiment which will be described hereinafter. In this embodiment the drive connecting portion is constituted by the spring 70, the downstream drive transmission member 71, the disconnecting cam 272, upstream of drive transmission member 474, the developing device covering member 432 and the driving side cartridge cover member 424. They will be described in detail.

103131 The bearing member 45 rotatably supports the downstream drive transmission member 71. In more detail, the first shaft receiving portion 45p (cylindrical outer surface) of the bearing member 45 rotatably supports a supported portion 71 p (cylindrical inner surface) of the downstream drive transmission member 71 (Figure 43 and 47).

103141 Further, the bearing member 45 rotatably supports the developing roller 6. In more detail, the second shaft receiving portion 45q (cylindrical inner surface) of the bearing member 45 rotatably supports a shaft portion 6a of the developing roller 6.

103151 The shaft portion 6a of the developing roller 6 is fitted into the developing roller gear 69. An outer peripheral surface 71 8 of the downstream drive transmission member 71 is formed into a gear portion engaged with the developing roller gear 69. In this manner, the rotational force is transmitted to the developing roller 6 through the developing roller gear 69 from the downstream drive transmission member 71.

103161 Figure 47 shows structures of the bearing member 45, the spring 70, the downstream drive transmission member 71 and the developing roller gear 69.

Figure 48 is a sectional view of the parts.

103171 The first shaft receiving portion 45p (cylindrical outer surface), as a first guide portion, of the bearing member 45 rotatably supports the supported portion 71p (cylindrical inner surface), as a first guided portion, the downstream drive is transmission member 71 (Figure 48). In the state that the supported portion 7ip (cylindrical inner surface) is engaged with the first shaft receiving portion 45p (cylindrical outer surface), the downstream drive transmission member TI is movable along a rotation axis (rotational center) X. In other words, the bearing member 45 supports is downstream drive transmission member 71 slidably along the rotation axis X In other words, the downstream drive transmission member 71 is slidable in directions of arrows M and N relative to the bearing member 45.

Part (a) of Figure 48 is sectional views of the related parts, part (b) of Figure 48 shows the state in which the downstream drive transmission member 71 has moved relative to the bearing member 45 in the direction of the arow N from the position shown in part (a) of Figure 48. The downstream drive transmission member 71 is movable in the directions of arrows Ni and N in engagement with the developing roller gear 69. In order to make easier the movement of the downstream drive transmission member 71 in the directions of arrows M and N, the gear portion 71g of the downstream drive transmission member 71 is preferably a spur gear rather than a helical gear.

103181 Between the bearing member 45 and the downstream drive transmission member 71, the spring 70 which is the elastic member as the urging member is provided. The spring 70 urges the downstream drive transmission member 71 in the direction of the arrow Nt 103191 Figure 49 shows structures of the upstream drive transmission member 474 as the first coupling member and the downstream drive transmission member 71 as the second coupling member. In Figure 49, the disconnecting cam 272 between the upstream drive transmission member 474 and the downstream drive transmission member 71 is omitted.

103201 The downstream drive transmission member 71 is provided with a claw portion 71a as an engaging portion, and the upstream drive transmission member is 474 is provided with a claw portion 474a as an engaging portion, The claw portion 71a and the claw portion 474a are engageable with each other. That is, the downstream drive transmission member TI is connectable with the upstream drive transmission member 474. In this embodiment, the claw portion 71a and the claw portion 474a each have six claws, 103211 Figure 50 is a sectional view of the drive connecting portion including the downstream drive transmission member 71 and the upstream drive transmission member 474, In Figure 50, the disconnecting cam 272 between the upstream drive transmission member 474 and the downstream drive transmission member 71 is omitted, As shown in the Figure, the contact portion 71n and the contact portion 474n between the claw portion 71a and the claw portion 474a is inclined only an angle y relative to the axis X. More particularly, the contact portion 71n of the downstream drive transmission member 71 overlaps at least a part of the upstream drive transmission member 474 with respect to a direction parallel with the rotational center X. Tn other words, the contact portion 71n overhangs a part of the downstream drive transmission member 71, and the contact portion 474n overhangs a part of the downstream drive transmission member 474.

Further in other words, the contact portion 7 In overhangs a phantom plane perpendicular to the rotational axis of the downstream drive transmission member 71, and the contact portion 474n overhangs a phantom plane perpendicular to the rotational axis of the downstream drive transmission member 474. With such a structure, in the drive transmission, the claw portion 71a and the claw portion 474a mutually pull each other in the direction of the axis X. 103221 In the drive transmission, the drive is transmitted from the upstream drive transmission member 474 and the downstream drive transmission member 71 To the upstream drive transmission member 474 and the downstream drive transmission member 71, a pulling force and an urging force of the spring 70 are is applied. A resultant force thereof the upstream drive transmission member 474 and the downstream drive transmission member 71 are connected with each other during the drive transmission, Here, the inclination angles ni of the contact portion 71n and the contact portion 474n relative to the axis Xis preferably approx. l -approx. 3.5° . During the drive transmission and disconnecting operations, the contact portion 471n and the contact portion 71n are worn by sliding (the drive transmission and disconnecting operations will be described hereinafter). In addition, the claws may be defomied during the drive transmission operation. Even if the wearing and/or deformation of the contact portion 71n and the contact portion 474n occurs, the contact portion 71n and the contact portion 474n pull to each other, so that the connection between the upstream drive transmission member 474 and the downstream drive transmission member 71 can be assured, and therefore, the drive transmission is stable.

When the upstream drive transmission member 474 and the downstream drive transmission member 71 are separated from each other due to the wearing and/or deformation of the contact portion 71n and the contact portion 474n, the urging force of the spring 70 may be made larger to assure the connection between the upstream drive transmission member 474 and the downstream drive transmission member 71. However, in this case, in the drive disconnecting operation which will be described hereinafter in which the downstream drive transmission member 71 is retracted from the upstream drive transmission member 474 against the urging force of the spring 70, the required force is large, If the inclination angles of the contact portion 71n and the contact portion 474n relative to the axis X is too large, the pulling force during the drive transmission is large, and therefore, the drive transmission is stabilization, but the force required to separate the upstream drive transmission member 474 and downstream of drive transmission member 71 from each other in the drive disconnection operation is is large.

103231 The upstream drive transmission member 474 is provided with the drive inputting portion 474b engageable with the developing device-drive output member 62 shown in part (b) of Figure 3 from the main assembly 2 of the apparatus. The drive inputting portion 474b has a substantially triangular prism twisted by a small angle.

103241 As shown in Figure 49, a hole portion 71m is provided at the center portion of the downstream drive transmission member 71. The hole portion 71m engages with a small diameter cylindrical portion 474m of the upstream drive transmission member 474. By doing so, the downstream drive transmission member 71 is supported slidably relative to the upstream drive transmission member 474 (rotatable and slidable in the axis directions).

103251 As shown in Figure 43 and Figure 46, the disconnecting cam 272 is disposed between the downstream drive transmission member 71 and the upstream drive transmission member 474.

103261 Figure 51 shows a relationship between the disconnecting cam 272 arid the developing device covering member 432. In Figure 51, the upstream drive transmission member 474 disposed between the disconnecting cam 272 and the developing device covering member 432 is omitted.

103271 The disconnecting cam 272 has a substantially ring configuration and has an outer peripheral surface 272i, and the developing device covering member 432 has all inner peripheral surface 432i. The inner peripheral surface 432i is engageable with the outer peripheral surface 272i. By this, the disconnecting cam 272 is slidable relative to the developing device covering member 432 (slidable along the axis of the developing roller 6).

103281 The developing device covering member 432 is provided with a guide 432h as a (second) guide portion, and the disconnecting cam 272 is provided with is a guide groove 272h as a (second) guided portion. The guide 432h and the guide groove 272h are in parallel with the axial direction. Here, the guide 432h of the developing device covering member 432 is engaged with the guide groove 272h of the disconnecting cam 272. By the engagement between the guide 432h and the guide groove 272h, the disconnecting cam 272 is slidable relative to the developing device covering member 432 only in the axial direction (wows M and N).

103291 Figure 52 is a sectional view of the drive connecting portion.

103301 As described above, the supported portion 7ip (cylindrical inner surface) of the downstream drive transmission member 71 and the first shaft receiving portion 45p (cylindrical outer surface) of the bearing 45 are engaged with each other, In addition, a cylindrical portion 71q of the downstream drive transmission member 71 and an inside circumference 432q of the developing device covering member 432 are engaged with each other. That is, the downstream drive transmission member TI is rotatably supported at the opposite end portions thereof by the bearing member 45 and the developing device covering member 432.

103311 In addition, a hole portion 432p as a supporting portion for supporting one end portion side of-the developing device covering member 432 rotatably supports a cylindrical portion 474p as a supported portion at one end portion side of-the upstream drive transmission member 474 (Figure 52). Also, a hole portion 45k as a supporting portion for supporting the other end portion side of-the bearing member 45 rotatably supports a small diameter cylindrical portion 474k as a supported portion at the other end portion side of-the upstream drive transmission member 474. In other words, the upstream drive transmission member 474 is rotatably supported at the opposite end portions thereof by the bearing member 45 and the developing device covering member 432. At a is position between the opposite end portions, the small diameter cylindrical portion 474m as the engaging portion of the upstream drive transmission member 474 is engaged with the hole portion 7]m as the engaging portion of the downstream drive transmission member 71 (Figure 49).

103321 The first shaft receiving portion 45p (cylindrical outer surface) of the bearing member 45, the inside circumference 432q of the developing device covering member 432 and the hole portion 432p are aligned with the rotational center X of the developing unit 9. That is, the upstream drive transmission member 474 is supported rotatably about the rotational center X of the developing unit 9. In addition, the downstream drive transmission member 71 is also supported rotatably about the rotational center X of the developing unit 9.

By this, the drive to the developing roller can be switched accurately in interrelation with the spacing operation of the developing roller 6.

103331 As described hereinbefore, the disconnecting cam 272 is provided between the downstream drive transmission member TI and the upstream drive transmission member 474, [0334] As shown in Figures 43 and 46, the claws 71a of the downstream drive transmission member 71 and the claws 474a of the upstream drive transmission member 474 are engaged with each other through a hole 272d of the disconnecting cam 272. In other words, the engaging portion between the downstream drive transmission member 71 and the upstream drive transmission member 474 are overlapped at least partly with the disconnecting cam 272 with respect to the direction parallel with the rotational center X. [0335] Part (a) of Figure 52 is a sectional view of the drive connecting portion illustrating a state in which the claws 71a of the downstream drive transmission member 71 and the claws 474a of the upstream drive transmission member 474 are engaged with each other. Part (b) of Figure 52 is a sectional view of the is drive connecting portion in which the claws 71a of the downstream drive transmission member 71 and the claws 474a of the upstream drive transmission member 474 are spaced from each other.

[0336] Longitudinally outside of the developing device covering member 432, the driving side cartridge cover member 424 is provided. Figure 53 shows the arrangement of the downstream drive transmission member 71, the disconnecting cam 272, the developing device covering member 432 and the driving side cartridge cover member 424. In Figure 53, the upstream drive transmission member 474 disposed between the disconnecting cam 272 and the developing device covering member 432 is omitted.

[0337] The disconnecting cam 272 is provided with a contact portion (inclined surface) 272a, and the driving side cartridge cover member 424 is provided with a contact portion (inclined surface 424b as an operating member. Furthermore, the developing device covering member 432 is provided an opening 432] A contact portion 272a of the disconnecting cam 272 and a contact portion 424b of the driving side cartridge cover member 424 are contactable to each other through the opening 432] of the developing device covering member 432.

103381 [Drive disconnecting operation] [0339] The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described.

[State 1j 0 [0340] As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 45a of the bearing member 45 are spaced by a gap d. At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state 1" of the main assembly spacing member 80.

Part (a) of Figure 54 schematically shows the drive connecting portion at this time. As shown in Figure 7, as seen in the direction of the axis developing roller, the force receiving portion (spacing force receiving portion) 45a projects in the substantially opposite side from the upstream drive transmission member 474 (rotational axis X) across the developing roller 6. Part (b) of Figure 54 is a perspective view of the drive connecting portion. In Figure 54, some parts are omitted for better illustration, In addition, in part (a) of Figure 54, a pair of the upstream drive transmission member 474 and the downstream drive transmission member 71, and a pair of the disconnecting cam 272 and the driving side cartridge cover member 424 are separately shown. In part (b) of Figure 54, only a part of the driving side cartridge cover member 424 including the contact portion 424b is shown, and only a part the developing device covering member 432 including the guide 432h is shown, Between the contact portion 272a of the disconnecting cam 272 and the contact portion 424b of the cartridge cover member 424, there is a gap e. At this time, the claws 474a of the upstream drive transmission member 474 and the claws 71a of the downstream drive transmission member 71 are engaged with each other by an engagement depth q.

As described above, the downstream drive transmission member 71 is engaged with the developing roller gear 69 (Figure 47), Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller gear 69 through the downstream drive transmission member 71. By this, the developing roller 6 is driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 2j 103411 When the main assembly spacing member 80 moves in the direction indicated by an arrow Fl by b I in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 is rotates about the rotation axis X in the direction of the arrow K by the angle 6 1, as described in the foregoing. As a result, the developing roller 6 is spaced from the drum 4 by a distance. I. The disconnecting cam 272 and the developing device covering member 432 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 0 1 in interrelation with the rotation of the developing unit 9. On the other hand, when the cartridge P is mounted to the main assembly 2 of the apparatus, the drum unit 8, the driving side cartridge cover member 424 and the non-driving side cartridge cover member 25 are positioned in place in the main assembly 2 of the apparatus. As shown in part (a) of Figure 55 and part (b) of Figure 55, the contact portion 424b of the driving side cartridge cover member 424 does not move. In the Figure, the disconnecting cam 272 rotates in the direction of the arrow K in the Figure in interrelation with the rotation of the developing unit 9 the contact portion 272a of the disconnecting cam 272 and the contact portion 424b of the driving side cartridge cover member 424 start to contact to each other. At this time, the claw 474a of the upstream drive transmission member 474 and the claw 71a of the downstream drive transmission member 71 are kept engaging with each other (part (a) of Figure 55), Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly of the apparatus 2 is transmitted to the developing roller 6 through the downstream drive transmission member 71 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state.

[State 31 103421 Part (a) of Figure 56 and part (b) of Figure 56 show the drive connecting portion when the main assembly spacing member 80 moves from the developing device spacing and drive transmission state in the direction of the arrow Fl only o 2 in the Figure as shown in part (c) of Figure 7. In interrelation with the is rotation of the developing unit 9 by the angle 6 2 (> 6), the disconnecting cam 272 and the developing device covering member 432 rotate. On the other hand, the driving side cartridge cover member 424 does not change its position similarly to the foregoing, but the disconnecting cam 272 rotates in the direction of the arrow K in the Figure. At this time the contact portion 272a of the disconnecting cam 272 receives a reaction force from the contact portion 424b of the driving side cartridge cover member 424. In addition, as described above, the guide groove 272h of the disconnecting cam 272 is limited by engaging with the guide 432h of the developing device covering member 432 to be movable only in the axial direction (arrows Ni and N) (Figure 51). As a result, the disconnecting cam 272 slides by p in the direction of the arrow N relative to the developing device covering member, In interrelation with the movement of the disconnecting cam 272 in the direction of the arrow N, an urging surface 272c of the disconnecting cam 272 urges an urged surface 71c of the downstream drive transmission member 71. By this, the downstream drive transmission member 71 slides in the direction of the arrow N by p against the urging force of the spring 70 (parts (b) Figure 52 and Figure 56).

103431 At this time, the movement distance p is larger than the engagement depth q between the claws 474a of the upstream drive transmission member 474 and the claws 71 a of the downstream drive transmission member 71, and therefore, the claws 474a and the claws 71a are disengaged from each other.

Then, since the upstream drive transmission member 474 receives the driving force from the main assemlily 2 of the apparatus, it continues to rotate, and on the other hand, the downstream drive transmission member 71 stops. As a result, the rotation of the developing roller gear 69, and therefore, the rotation of the developing roller 6 stop. The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

[0344] In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 is capable of spacing from the drum 4 while rotating. As a result, the drive for the developing roller 6 can be stopped in accordance with the space distance between the developing roller 6 and the drum 4 [Drive connecting operationi [0345] Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

[0346] In the spaced-dev&oping-device-state (the state in which the developing unit 9 is in the angle 0 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 474a of the upstream drive transmission member 474 and the claws 7ta of the downstream drive transmission member 71 are in a disconnected state, as shown in Figure 56.

103471 In the angle 0 I position of the developing unit 9 (the state shown in part (b) of Figure 7 and Figure 55) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 474a of the upstream drive transmission member 474 and the claws 71a of the downstream drive transmission member 71 are engaged with each other by the downstream drive transmission member 71 moving in the direction of the arrow M by the urging force of the spring 70. By this, the driving force from the main assembly 2 is transmitted to the developing rofler 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other, [0348] By ifirther rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum [0349] The foregoing is the exp'anation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow H. With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmifted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4.

[0350] As described in the foregoing, according to the structures, the drive disconnection state and the drive transmission state to the dev&oping roller 6 are determined firmly by the rotation angle of the developing unit 9.

[Embodiment 5] 103511 A cartridge according to a fifth embodiment of the invention will be described. In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted.

[Structure of the developing unit] 103521 As shown in Figures 57 and 58, the developing unit 9 comprises the developing roller 6, a developing blade 3, the developing device frame 29, a bearing member 45, a developing device covering member 432 and so on.

103531 In addition, as shown in Figure 57, the bearing member 45 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 45 rotatably supports the developing roller 6. The developing roller 6 is provided with a developing roller gear 69 at a longitudinal end portion. Also, the bearing member 45 rotatably supports an idler gear 68 as a third drive transmission member for transmitting the driving force to the developing roller gear 69. The idler gear 68 has a substantially cylindrical shape.

103541 The developing device covering member 432 is fixed to an outside of the bearing member 45 with respect to the longitudinal direction of the cartridge P. The developing device covering member 432 covers the developing roller gear 69, the idler gear 68, the upstream drive transmission member 474 a first drive transmission member, and the downstream drive transmission member 571 as a second drive transmission member. Furthermore, the developing device covering member 432 is provided with a cylindrical portion 432b, The cylindrical portion 432b is provided with an inside opening 432d through which the drive inputting portion 474b of the upstream drive transmission member 474 is exposed. When the cartridge P (PY, PM, PC, PlC) is mounted to the main assembly 2 of the apparatus, the drive inputting portion 474b engages with the developing device-drive output member 62 (62Y, 62M, 62C, 62K) shown in part (b) of Figure 3 to transmit the driving force from the driving motor (unshown) provided in the main assembly 2 of the apparatus. That is, the upstream drive transmission member 474 functions as a development input coupling. The driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller gear 69 and the developing roller 6 through the downstream drive transmission member 57] and the idler gear 68 as the third drive transmission member. The structures of a drive connecting portion will be described in detail hereinafter.

[Structure of the drive connecting portionj 103551 Referring to Figures 57 and 58, the structure of the drive connecting portion will be described.

103561 The general arrangement thereof will be described, first.

103571 Between the bearing member 45 and the driving side cartridge cover member 424, there are provided the idler gear 68, a spring 70 which is an elastic is member as an urging member, the downstream drive transmission member 571 as a second coupling member, a disconnecting cam 272 as a disconnecting member which is a part of a disconnecting mechanism, the upstream drive transmission member 474 as a first coupling member, and the developing device covering member 432, in the order named, in the direction from the bearing member 45 toward the driving side cartridge cover member 424. These members are coaxial with the upstream drive transmission member 474. In this embodiment, the drive connecting portion is constituted by the idler gear 68, the spring 70, the downstream drive transmission member 571, the disconnecting cam 272, the upstream drive transmission member 474, the developing device covering member 432 and the driving side cartridge cover member 424. They will be described in detail.

103581 The bearing member 45 rotatably supports the idler gear 68 as the rotational force transmission member. In more detail, the first shaft receiving portion 45p (cylindrical outer surface) of the bearing member 45 rotatably supports a supported portion 68p (cylindrical inner surface) of the idler gear 68 (Figures 57 and 58). Here, the idler gear 68 is provided with a gear portion 68 g at an outer peripheiy portion thereof 103591 The bearing member 45 rotatably supports the developing roller 6. In more detail, the second shaft receiving portion 45q (cylindrical inner surface) of the bearing member 45 rotatably supports a shaft portion 6a of the developing roller 6.

103601 The shaft portion 6a of the developing roller 6 is fitted into the developing roller gear 69. By doing so, the rotational force is transmitted to the developing roller 6 through the developing roller gear 69 from the idler gear 68.

103611 Figure 59 shows the structures of the idler gear 68, the spring 70 and the downstream drive transmission member 57 t. Part (b) of Figure 59 shows a state is in which the parts are assembled.

103621 The idler gear 68 has a substantially cylindrical shape and is provided with a guide 68a as a first guide portion therein. The guide portion 68a is in the form of a shaft portion extending substantial in parallel with the rotational axis X. On the other hand, the downstream drive transmission member 57] is provided with a hole portion 571b as a first guided portion. In a state that the guide 68a is in engagement with the hole portion 571b, the downstream drive transmission member 57t is movable along the rotational center X. In other words, the idler gear 68 holds therein the downstream drive transmission member 57 t slidably along the rotational axis, Further in other words, the downstream drive transmission member 571 is slidable in the directions of arrows M and N relative to the idler gear 68.

103631 Here, the guide portion 68a receives the rotational force for rotating the developing roller 6 from the hole portion 57ib, 103641 In this embodiment, the guide 68a is provided at each of four positions degrees away from adjacent ones about the rotational center X, and extends in parallel with the rotational center X. Correspondingly, the hole portion 571b is provided at each of four positions 90 degrees away from adjacent ones about the rotational center X. The numbers of the guide 68a and the hole portion 571b are not limited to four. It is preferable that the numbers of the guides 68a and the hole portions 571b are plural and that they are disposed equidistantly along a circumference about the axis X. In this case, a resultant force of the forces applied in the guides 68a or the hole portions 571b produces a moment of rotating the downstream drive transmission member 571 and the idler gear 68 about the axis X. Then, tilting of the downstream drive transmission member 571 and the idler gear 68 relative to the axis X can be suppressed.

103651 In addition, between the idler gear 68 and the downstream drive is transmission member 571, the spring 70 which is the elastic member as the urging member is provided. To state shown in part (b) of Figure 59, the spring is provided inside the idler gear 68 to urge the downstream drive transmission member 571 in the direction of the arrow NI. That is, the downstream drive transmission member 571 is movable into the idler gear 68 against the elastic force of the spring 70. The downstream drive transmission member 571 is disconnected from the upstream drive transmission member 474 by moving into the idler gear 68.

103661 Figure 60 shows structures of the upstream drive transmission member 474 as the first coupling member and the downstream drive transmission member 571 as the second coupling member. In Figure 60, the disconnecting cam 272 between the upstream drive transmission member 474 and the downstream drive transmission member 571 is omitted.

103671 The downstream drive transmission member 571 is provided with a claw portion 571a as an engaging portion, and the upstream drive transmission member 474 is provided with a claw portion 474a as an engaging portion. The claw portion 571 a and the claw portion 474a are engageable with each other. In this embodiment, the claw portion 571 a and the claw portion 474a each have six claws.

103681 The upstream drive transmission member 474 is provided with the drive inputting portion 474b engageable with the developing device-drive output member 62 shown in part (b) of Figure 3 from the main assembly 2 of the apparatus. The drive inputting portion 474b has a substantiafly triangular prism twisted by a small angle.

103691 The downstream drive transmission member 571 is provided with a hole portion 571m as an engaging portion at a center portion. The hole portion 571m is engaged with a small diameter cylindrical portion 474m as an engaging portion is of the upstream drive transmission member 474, By doing so, the downstream drive transmission member 571 is supported slidably relative to the upstream drive transmission member 474 (rotatable and slidable along the axes).

103701 Here, as shown in Figures 57 and 58, the disconnecting cam 272 is disposed between the downstream drive transmission member 571 and the upstream drive transmission member 474, Similarly to the first embodiment, the disconnecting cam 272 is slidable only in the axial direction r&ative to the developing device covering member 432 (directions of the arrows lvi and N) (Figure 5t).

103711 Figure 6] is a sectional view of the drive connecting portion.

103721 As described above, the cylindrical portion 68p of the idler gear 68 and the first shaft receiving portion 45p (cylindrical outer surface) of the bearing 45 are engaged with each other. In addition, the cylindrical portion 68q of the idler gear 68 and the inside circumference 432q of the developing device covering member 432 are engaged with each other. That is, the idler gear 68 is rotatably supported at the opposite end portions by the bearing member 45 and the developing device covering member 432.

103731 By the engagement between the cylindrical portion 474p of the upstream drive transmission member 474 and the hole portion 432p of the developing device covering member 432, the upstream drive transmission member 474 is slidably supported relative to the developing device covering member 432 (slidable along the axis of the developing roller).

to 103741 The first shaft receiving portion 45p (cylindrical outer surface) of the bearing member 45, the inside circumference 432q of the developing device covering member 432 and the hole portion 432p are aligned with the rotational center X of the developing unit 9. That is, the upstream drive transmission member 474 is supported rotatably about the rotational center X of the is developing unit 9. As described above, the cylindrical portion 474m of the upstream drive transmission member 474 and the hole portion 571m of the downstream drive transmission member 571 are engaged with each other rotatably and slidably along the rotation axis X (Figure 60). By doing so, as a result, the downstream drive transmission member 571 is also supported rotatably about the rotational center X of the developing unit 9.

103751 In the sectional view of the drive connecting portion shown in part (a) of Figure 61, the claws 571a as the coupling portion of the downstream drive transmission member 571 and the claws 474a as the coupling portion of the upstream drive transmission member 474 are engaged with each other. Part (b) of Figure 61 is a sectional view of the drive connecting portion in which the claws 571a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are spaced from each other.

103761 [drive disconnecting operation] 103771 The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described.

[State I] 103781 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 45a of the bearing member 43 are spaced by a gap d. At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state 1" of the main assembly spacing member 80.

Part (a) of Figure 62 schematically shows the drive connecting portion at this time. Part (b) of Figure 62 is a perspective view of the drive connecting portion.

In Figure 62, some parts are omitted for better illustration. In addition, in part (a) of Figure 62, a pair of the upstream drive transmission member 474 and the downstream drive transmission member 571, and a pair of the disconnecting cam 272 and the driving side cartridge cover member 424 are separately shown. In part (b) of Figure 62, only a part of the driving side cartridge cover member 424 including the contact portion 424b is shown, and only a part the developing device covering member 432 including the guide 432h is shown. Between the contact portion 272a of the disconnecting cam 272 and contact portion 424b as the operating portion of the driving side cartridge cover member 424, there is a gap e. At this time, the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are engaged with each other by an engagement depth q. In addition, as described above, the downstream drive transmission member 571 engages with the idler gear 68 (Figure 59). Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly of the apparatus 2 is transmitted to the idler gear 68 and developing roller gear 69 through the downstream drive transmission member 571. By this, the developing roller 6 is driven. The positions of the parts at this time is cafled a contacting position, a development contact and drive transmission state.

[State 21 103791 When the main assembly spacing member 80 moves in the direction indicated by an arrow Fl by 6 1 in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 rotates about the rotation axis X in the direction of an arrow K by an angle 6 1.

As a result, the developing roller 6 is spaced from the drum 4 by a distance F 1.

The disconnecting cam 272 and the developing device covering member 432 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 6 1 in interrelation with the rotation of the developing unit 9. On the other hand, when the cartridge P is mounted to the main assembly 2 of the apparatus, the drum unit 8, the driving side cartridge cover member 424 and the non-driving is side cartridge cover member 25 are positioned in place in the main assembly 2 of the apparatus. As shown in part (a) of Figure 63 and part (b) of Figure 63, the contact portion 424b of the driving side cartridge cover member 424 does not move. In the Figure, the disconnecting cam 272 rotates in the direction of the arrow K in the Figure in interrelation with the rotation of the developing unit 9 the contact portion 272a of the disconnecting cam 272 and the contact portion 424b of the driving side cartridge cover member 424 start to contact to each other.

At this time, the claw 474a of the upstream drive transmission member 474 and the claw 571 a of the downstream drive transmission member 571 are kept engaging with each other (part (a) of Figure 63). Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the downstream drive transmission member 571, the idler gear 68 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state.

[State 3j 103801 Part (a) of Figure 64 and part (b) of Figure 64 show the drive connecting portion when the main assembly spacing member 80 moves from the developing device spacing and drive transmission state in the direction of the arrow Fl only o 2 in the Figure as shown in part (c) of Figure 7. In interrelation with the rotation of the developing unit 9 by the angle 6 2 (> 6 1), the disconnecting cam 272 and the developing device covering member 432 rotate, On the other hand, the driving side cartridge cover member 424 does not change its position similarly to the foregoing, but the disconnecting cam 272 rotates in the direction of the arrow K in the Figure. At this time the contact portion 272a of the disconnecting cam 272 receives a reaction force from the contact portion 424b of the driving side cartridge cover member 424. In addition, as described above, is the guide groove 272h of the disconnecting cam 272 is limited by engaging with the guide 432h of the developing device covering member 432 to be movable only in the axial direction (arrows Ni and N) (Figure 51), Therefore, as a result, the disconnecting cam 272 slides in the direction of the arrow N by a movement distance p. In interrelation with the movement of the disconnecting cam 272 in the direction of the arrow N, an urging surface 272c of the disconnecting cam 272 urges an urged surface 571c of the downstream drive transmission member 571.

By this, the downstream drive transmission member 571 slides in the direction of the arrow N by p against the urging force of the spring 70 (Figure 64 and parts (b) of Figure 61), 103811 At this time, the movement distance p is larger than the engagement depth q between the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571, and therefore, the claws 474a and the claws 571a are disengaged from each other, Then, since the upstream drive transmission member 474 receives the driving force from the main assembly 2 of the apparatus, it continues to rotate, and on the other hand, the downstream drive transmission member 571 stops. As a result, the rotations of the idler gear 68, the developing roller gear 69 and the developing roller 6 stop. The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

103821 In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 can space from the drum 4 while rotating, so that the drive to the developing roller 6 can be stopped in accordance with the spacing distance between the developing roller 6 and the drum 4.

[Drive connecting operation] is [0383] Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

[0384] In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 6 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are in a disconnected state, as shown in Figure 64.

[0385] In the angle 6 1 position of the developing unit 9 (the state shown in part (b) of Figure 7 and Figure 63) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are engaged with each other by the downstream drive transmission member 571 moving in the direction of the arrow lvi by the urging force of the spring 70. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

103861 By fhrther rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum 4.

103871 The foregoing is the explanation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow H. With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmitted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4.

103881 Particularly in the case of this embodiment, when the switching between the drive disconnection and the drive transmission to the developing roller 6 is effected, it is unnecessary to move the idler gear 68 relative to the developing roller gear 69 in the axial direction. If the gears are helical gears, a thrust force (force in the axial direction) is produced in the gear drive transmitting portion.

Therefore, in the case of the first embodiment, in order to move the idler gear 68 as the second coupling member in the axial direction (arrow M or N), a force against the thrust force is required.

103891 On the other hand, in the case of this embodiment, the downstream drive transmission member 571 engages with the guide 68a of the idler gear 68 to move in the axial direction. Therefore, the force required when the downstream drive transmission member 571 as the second coupling member is moved in the axial direction can be made smaller.

103901 Furthermore, if the downstream drive transmission member 571 can be disposed in the inside circumference of the idler gear 68, the longitudinal size of the entire developing unit 9 can be reduced. Figure 65 is a sectional view of the drive connecting portion of this embodiment. In the axial direction, a width 57] y of the downstream drive transmission member 571, a movement space p of the downstream drive transmission member 571 and a width 68x of the idler gear 68 are required. The width 5'7ly of the downstream drive transmission member 571 and the entirety or a part of the movement space p can be overlapped with the inside of the width 68x of the idler gear 68, by which the longitudinal size of the entire developing unit 9 can be reduced.

[Embodiment 6] 103911 A cartridge according to a sixth embodiment of the invention will be described. In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted.

[Structure of the drive connecting portioni 103921 Referring to Figures 66 and 67, the structure of the drive connecting portion will be described.

[0393] The general arrangement thereof will be described, first.

103941 Between the bearing member 45 and the driving side cartridge cover member 624, there are provided, in the order named in the direction from the bearing member 45 toward the driving side cartridge cover member 624, an idler gear 68 as a third drive transmission member, a spring 70 which is an elastic member as an urging member, a downstream drive transmission member 57] as a second coupling member, a disconnecting cam 672 as an operating member which is a coupling releasing member and which is a part of a disconnecting mechanism, an upstream drive transmission member 474 as a first coupling member, and a developing device covering member 632. These members are coaxial with the upstream drive transmission member 474, In this embodiment, the drive connecting portion is constituted by the idler gear 68, the spring 70, the downstream drive transmission member 571, the disconnecting cam 672, the upstream drive transmission member 474, the developing device covering member 632 and the driving side cartridge cover member 624.

103951 Figure 68 shows a relationship between the disconnecting cam 672 arid the developing device covering member 632. In Figure 68, the upstream drive transmission member 474 disposed between the disconnecting cam 672 and the developing device covering member 632 is omitted. The disconnecting cam 672 is provided with a ring portion 672] having a substantially ring configuration.

The ring portion 672j is provided with an outer peripheral surface 672i as a is second guided portion, and the developing device covering member 632 is provided with an inner peripheral surface 632i as a part of a second guide portion.

The inner peripheral surface 632i is engageable with the outer peripheral surface 672i. In addition, the outer peripheral surface 672i of the disconnecting cam 672 and the inner peripheral surface 632i of the developing device covering member 632 are co-axial with the rotational center X. That is, the disconnecting cam 672 is supported slidably in the axial direction relative to the developing device covering member 632 and developing unit 9 and rotatably in the rotational moving direction about the axis X. 103961 In addition, the ring portion 672j of the disconnecting cam 672 as the coupling releasing member is provided with a contact portion (inclined surface) 672a as a force receiving portion. The developing device covering member 632 is provided with a contact portion (inclined surface) 632r. Here, a contact portion 672a of the disconnecting cam 672 and a contact portion 632r of the developing device covering member 632 are contactable to each other.

103971 Figure 69 shows structures of the drive connecting portion and the driving side cartridge cover member 624. The disconnecting cam 672 includes a projected portion 672m projected from the ring portion 672j. The projected portion has a force receiving portion 672b as the second guided portion. The force receiving portion 672b receives a force from the driving side cartridge cover member 624 by the engagement with a regulating portion 624d as a part of the second guide portion of the driving side cartridge cover member 624. The force receiving portion 672b projects through an opening 632c provided in a part of a cylindrical portion 632b of the developing device covering member 632 to be engageable with the regulating portion 624d of the driving side cartridge cover member 624. By the engagement between the regulating portion 624d and the force receiving portion 672b, the disconnecting cam 672 is slidable only in the is axial direction (arrows M and N) relative to the driving side cartridge cover member 624. Similarly to the first and second embodiments, an outside circumference 632a of the cylindrical portion 632b of the developing device covering member 632 slides on a sliding portion 624a (cylindrical inner surface) of the driving side cartridge cover member 624. That is, the outside circumference 632a is rotatably connected with the sliding portion 624a.

103981 In a drive switching operation which will be described hereinafter, when the disconnecting cam 672 slides in the axial direction (arrows M and N), an axis tilting may occur relative to the axial direction. If the tilting occurs, the drive switching property such as the timing of the driving connection and the disconnecting operation may be deteriorated. In order to suppress the axis tilting of the disconnecting cam 672, it is preferable that a sliding resistance between the outer peripheral surface 672i of the disconnecting cam 672 and the inner peripheral surface 632i of the developing device covering member 632, and a sliding resistance between the force receiving portion 672b of the disconnecting cam 672 with regulating portion 624d of the driving side cartridge cover member 624 are reduced. In addition, as shown in Figure 70, it is also preferable that an outer peripheral surface 6172i of the disconnecting cam 6172 and an inner peripheral surface 6132i of the developing device covering member 6132 are extended in the axial direction to increase the engagement depth of the disconnecting cam 6172 with respect to the axial direction.

103991 As will be understood from the foregoing, the disconnecting cam 672 is engaged both with the inner peripheral surface 632i of the developing device covering member 632 which is a part of the second guide portion and with the regulating portion 624d of the driving side cartridge cover member 624 which is a part of the second guide portion. Thus, the disconnecting cam 672 is slidable (rotatable) in the rotational moving direction about the axis X and in the axial is direction (arrows M and N) relative to the developing unit 9, and is slidable only in the axial direction (arrows lvi and N) relative to the drum unit 8 and the driving side cartridge cover member 624 fixed to the drum unit 8.

[0400] Part (a) of Figure 71 is a perspective view of the cartridge Pin which the force applied to the developing unit 9 is schematically shown, and part (b) of Figure 71 is a side view of a part of the cartridge P as seen in the direction along the direction of the axis X. [0401] To the developing unit 9, a reaction forced QI applied from the urging spring 95, a reaction force Q2 applied from the drum 4 through the developing roller 6, and the weight Q3 thereof and soon are applied. In addition, during a drive disconnecting operation, the disconnecting cam 672 engages with the driving side cartridge cover member 624 to receive a reaction force Q4 (will be described hereinafter in detail). The resultant force QO of the reaction forces Qi, Q2 and Q4 and the weight Q3 is applied to supporting hole portions 624a, 25a of the driving side rotatably supporting the developing unit 9 and non-driving side cartridge cover members 624 arid 25.

104021 Therefore, the sliding portion 624a of the driving side cartridge cover member 624 contacting the developing device covering member 632 in the direction of the resultant force QO when the cartridge P is seen in the direction along the axial direction (part (b) of Figure 71) is required. The sliding portion 624a of the driving side cartridge cover member 624 is provided with a resultant force receiving portion 624a1 for receiving the resultant force QO (Figure 69).

On the other hand, with respect to the direction other than the direction of the resultant force QO, the cylindrical portion 632b of the developing device covering member 632 or the sliding portion 624a of the driving side cartridge cover member 624 is not inevitable. In this embodiment, in view of the above, the opening 632c is provided in a part of the cylindrical portion 632b of the is developing device covering member 632 slidable relative to the driving side cartridge cover member 624 in the direction different from the direction of the resultant force QO (opposite side with respect to the resultant force QO in this embodiment). In the opening 632c, the disconnecting cam 672 engageable with the regulating portion 624d of the driving side cartridge cover member 624.

104031 Figure 72 is a sectional view of the drive connecting portion.

[0404] The cylindrical portion 68p (cylindrical inner surface) of the idler gear 68 and the first shaft receiving portion 45p (cylindrical outer surface) of the bearing 45 are engaged with each other. In addition, the cylindrical portion 68q (cylindrical outer surface) of the idler gear 68 and the inside circumference 632q of the developing device covering member 632 are engaged with each other.

That is, the idler gear 68 is rotatably supported at the opposite end portions by the bearing member 45 and the developing device covering member 632.

104051 In addition, the cylindrical portion 474p (cylindrical outer surface) of the upstream drive transmission member 474 and the hole portion 632p of the developing device covering member 632 are engaged with each other. By this, the upstream drive transmission member 474 is supported slidably (rotatably) relative to the developing device covering member 632.

104061 The first shaft receiving portion 45p (cylindrical outer surface) of the bearing member 45, the inside circumference 632q of the developing device covering member 632 and the hole portion 632p are aligned with the rotational center X of the developing unit 9. That is, the upstream drive transmission member 474 is supported rotatably about the rotational center X of the developing unit 9. As described above, the cylindrical portion 474m of the upstream drive transmission member 474 and the hole portion 571m of the downstream drive transmission member 571 are engaged with each other (Figure 60). By doing so, as a result, the downstream drive transmission member 571 is is also supported rotatably about the rotational center X of the developing unit 9, 104071 Part (a) of Figure 72 is a sectional view of the drive connecting portion illustrating a state in which the claws 571a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are engaged with each other. Part (b) of Figure 72 is a sectional view of the drive connecting portion in which the claws 571a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are spaced from each other.

[Drive disconnecting operation] The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described.

[State Ij 104101 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 45a of the bearing member 45 are spaced by a gap d. At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state I" of the main assembly spacing member 80.

Part (a) of Figure 73 schematically shows the drive connecting portion at this time, Part (b) of Figure 73 is a perspective view of the drive connecting portion.

In Figure 73, some parts are omitted for better illustration. In part (a) of Figure 73, the pair of the upstream drive transmission member 474 and the downstream drive transmission member 571, and the pair of the disconnecting cam 672 and the developing device covering member 632 are shown separately. In part (b) of Figure 73, only a part of the developing device covering member 632 including the contact portion 632r is shown, and only a part of the cartridge cover member 624 including the regulating portion 624d is shown. Between the contact is portion 672a of the disconnecting cam 672 and the contact portion 632r of the developing device covering member 632, there is a gap e. At this time, the claws 474a of the upstream drive transmission member 474 and the claws 57 a of the downstream drive transmission member 571 are engaged with each other by an engagement depth q. In addition, as described above, the downstream drive transmission member 571 engages with the idler gear 68 (Figure 59). Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly of the apparatus 2 is transmitted to the idler gear 68 and the developing roller gear 69 through the downstream drive transmission member 57]. By this, the developing roller 6 is driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 21 104111 When the main assembly spacing member 80 moves in the direction indicated by an arrow Fl by 8 1 in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 rotates about the rotation axis X in the direction of an arow K by an angle 6 1 As a result, the developing roller 6 is spaced from the dmm 4 by a distance The disconnecting cam 672 and the developing device covering member 632 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 6 1 in interrelation with the rotation of the developing unit 9. The disconnecting cam 672 is incorporated in the developing unit 9, but as shown in Figure 69, the force receiving portion 672b is engaged with an engaging portion 624d of the driving side cartridge cover member 624. Therefore, even if the developing unit 9 rotates, the position of the disconnecting cam 672 does not change. In other words the disconnecting cam 672 moves relative to the developing unit 9. As shown in part (a) of Figure 74 and part (b) of Figure 74 show the state in which the contact portion 672a of the disconnecting cam 672 and the contact portion 632r of the developing device covering member 632 start to contact to each other. At this time, the claw 474a of the upstream drive transmission member 474 and the claw 571a of the downstream drive transmission member 571 are kept engaging with each other (part (a) of Figure 74). Therefore, the driving force inpufted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the downstream drive transmission member 571, the idler gear 68 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state. In the state 1, it is not inevitable that the force receiving portion 672b contacts the engaging portion 624d of the driving side cartridge cover member 624. More particularly, in the state 1, the force receiving portion 672b may be spaced from the engaging portion 624d of the driving side cartridge cover member 624. In this case, in the process of shifting operation from the state Ito the state 2, the gap between the force receiving portion 672b and the engaging portion 624d of the driving side cartridge cover member 624 disappears, that is, the force receiving portion 672b is brought into contact to the engaging portion 624d of the driving side cartridge cover member 624.

[State 3j 104121 Part (a) of Figure 75 and part (b) of Figure 75 show the drive connecting portion when the main assembly spacing member 80 moves from the developing ic device spacing and drive transmission state in the direction of the arrow Fl only c3 2 in the Figure as shown in part (c) of Figure 7, In interrelation with the rotation of the developing unit 9 to the angle 6 2 (>6 1), the developing device covering member 632 rotates. At this time, the contact portion 672a of the disconnecting cam 672 receives a reaction force from the contact portion 632r of the developing device covering member 632. As described above, the disconnecting cam 672 is movably only in the axial direction (arrows M and N) by the engagement of the force receiving portion 672b with the engaging portion 624d of the driving side cartridge cover member 624 (Figure 69). Therefore, as a result, the disconnecting cam 672 slides in the direction of the arrow N by a movement distance p. In interrelation with the movement of the disconnecting cam 672 in the direction of the arrow N, an urging surface 672c, as the urging portion, of the disconnecting cam 672 urges the urged surface 57k, as the portion-to-be-urged, of the downstream drive transmission member 571. By this, the downstream drive transmission member 57! slides in the direction of the arrow N by p against the urging force of the spring 70 (Figure 75 and parts (b) of Figure 72).

104131 At this time, the movement distance p is larger than the engagement depth q between the claws 474a of the upstream drive transmission member 447 and the claws 571a of the downstream drive transmission member 571, and therefore, the claws 474a and the claws 571a are disengaged from each other.

Then, since the upstream drive transmission member 474 receives the driving force from the main assembly 2 of the apparatus, it continues to rotate, and on the other hand, the downstream drive transmission member 571 stops. As a result, the rotations of the idler gear 68, the developing roller gear 69 and the developing roller 6 stop. The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

104141 In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 can space from the drum 4 while rotating, so that the drive to the developing roller 6 can be stopped in accordance with the spacing distance between the developing roller 6 and the drum 4, [Drive connecting operation] 104151 Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

104161 In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 6 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are in a disconnected state, as shown in Figure 75.

104171 In the angle 6 1 position of the developing unit 9 (the state shown in part (b) of Figure 7 and Figure 74) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are engaged with each other by the downstream drive transmission member 57! moving in the direction of the arrow M by the urging force of the spring 70. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

104181 By fhrther rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum 4.

104191 The foregoing is the explanation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the is developing unit 9 in the direction of the arrow H. With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmitted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4.

104201 In the foregoing description, the force receiving portion 672b of the disconnecting cam 672 is engaged with the regulating portion 624d of the driving side cartridge cover member 624, but this is not inevitable, and it may be engaged with the cleaner container 26, for example.

104211 In this embodiment, particularly, the disconnecting cam 672 is provided with the contact portion 672a, and the contact portion 632r as the operating portion contacting thereto is provided on the developing device covering member 632, In addition, the engaging portion 672b relative to the drum unit 8 is projected through the opening 632c provided in a part of the cylindrical portion 632b of the developing device covering member 632. Therefore, the latitude of the arrangement of the engaging portion 672b and the engaging portion 624d as a part of the second guide portion actable thereon increases. More specifically, it is not necessary that the operating member is extended from a outside of the developing device covering member 632, with respect to the axial direction, through the hole 632j of the developing device covering member 632 as in the first and second embodiments.

104221 In the foregoing description, a process cartridge P detachably mountable to the image forming apparatus is taken as an example, but the present invention is applicable to a developing cartridge D detachably mountable to the image forming apparatus as shown in Figure 76, similarly to Embodiment 8 which will be described hereinafter.

104231 As a further analogous example, Figure 77 shows a developing cartridge D detachably mountable to the image forming apparatus. Figure 77 shows parts is provided at a driving side end portion of the developing cartridge D, and similarly to Embodiment 6, the parts include the downstream drive transmission member 57] and the upstream drive transmission member 474. Here, a disconnecting cam 6272 as the coupling releasing member has a force receiving portion 6272u for receiving a force in the direction of an arrow F2 from the main assembly of the image forming apparatus. When the disconnecting cam 6272 receives the force in the direction of the arrow F2 from the main assembly of the image forming apparatus, it rotates in the direction of the arrow H about a rotation axis X. Similarly to the above-described example, a contact portion 6272a as the force receiving portion provided on the disconnecting cam 6272 receives a reaction force from a contact portion 6232r of a developing device covering member 6232. By this, the disconnecting cam 6272 moves in the direction of the arrow N. Then, the upstream drive transmission member 474 and the downstream drive transmission member 571 are disengaged from each other, thus stopping the rotation of the developing rofler 6.

104241 When the drive is transmitted to the developing roller 6, the disconnecting cam 6272 is moved in the direction of the arrow lvi to engage the upstream drive transmission member 474 and the downstream drive transmission member 571 with each other. At this time, the force to the disconnecting cam 6272 in the direction of the arrow F2 is removed so that the disconnecting cam 6272 is moved in the direction of the arrow Musing the reaction force of the spring 70.

104251 As described in the foregoing, the drive transmission to the developing roller 6 can be switched even in the case that the developing roller 6 is always in contact with the drum 4.

104261 In the foregoing, the present invention is applied to the developing cartridge D, but the cartridge may be of another type, for example, it may be a is process cartridge P including a drum. More particularly, the structure of this embodiment is applicable to the structure in which the drive transmission to the developing roller is switched in the state that the drum 4 and the developing roller 6 contact to each other in the process cartridge P. 104271 In the foregoing embodiments, when the electrostatic latent image on the drum 4 is developed, the developing roller 6 is in contact with the drum 4 (contact-type developing system), but another developing system is usable. For example, a non-contact type developing system in which a small gap is provided between the drum 4 and the developing roller 6 during the development of the electrostatic latent image on the drum 4 is usable.

104281 As described in the foregoing, the cartridge detachably mountable to the image forming apparatus may be a process cartridge P including a drum or a developing cartridge D. [Embodiment 7] 104291 A cartridge according to a seventh embodiment of the invention will be described, In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted.

[Structure of the developing unit] 104301 As shown in Figures 78 and 79, the developing unit 9 comprises a developing roller 6, a developing blade 31, a developing device frame 29 and a bearing member 745 and so on, 104311 In addition, as shown in Figure 78, the bearing member 745 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 745 rotatably supports the developing roller 6. The developing roller 6 is provided with a developing roller gear 69 at a longitudinal end portion.

104321 In addition, to a driving side cartridge cover member 724, another is bearing member 35 is fixed (Figure 8). Between said another bearing member and the driving side cartridge cover member 724, there are provided an idler gear 68 as a third drive transmission member for transmitting the driving force to the developing roller gear 69, and a downstream drive transmission member 571 for transmitting the driving force to the idler gear 68.

104331 The bearing member 35 rotatably supports the idler gear 68 for transmitting the driving force to the developing roller gear 69. The driving side cartridge cover member 724 is provided with an opening 724c, Through the opening 724c, a drive inputting portion 474b of the upstream drive transmission member 474 is exposed. When the cartridge P is mounted to the main assembly 2 of the apparatus, the drive inputting portion 474b is engaged with a developing device-drive output member 62 (62Y, 62M, 62C, 62K) shown in part (b) of Figure 3 to transmit the driving force from a driving motor (unshown) provided in the main assembly 2 of the apparatus. That is, the upstream drive transmission member 474 functions as a development input coupling. The driving force inpufted to the upstream drive tnmsmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller gear 69 and the developing roller 6 through the downstream drive transmission member 571 and the idler gear 68. Figure 80 and Figure 81 are perspective views illustrating the developing unit 9, a drum unit 8 and the driving side cartridge cover member 724 to which the bearing member 35 is fixed. As shown in Figure 81, the bearing member 35 is fixed to the driving side cartridge cover member 724. The bearing member 35 is provided with a supporting portion 35a.

On the other hand, the developing device frame 29 is provided with a rotation hole 29c (Figure 80). When the developing unit 9 and drum unit 8 are connected with each other, the rotation hole 29c of the developing device frame 29 is engaged with the supporting portion 35a of the bearing member 35 in a one is longitudinal end portion side of the cartridge P. In addition, in the other longitudinal end portion side of the cartridge P, a projected portion 29b projected from the developing device frame 29 is engaged with a supporting hole portion 25a of the non-driving side cartridge cover member. By this, the developing unit 9 is supported rotatably relative to the drum unit 8. In this case, the rotational center X which is a rotational center of the developing unit 9 relative to the drum unit 8 is aligned with a line connecting the center of the supporting portion 35a of the bearing member 35 and the center of the supporting hole portion 25a of the cartridge cover member 25.

[Structure of the drive connecting portioni [0434] Referring to Figures 78 and 79, the structure of the drive connecting portion will be described.

[0435] The general arrangement thereof will be described, first. iii

104361 Between the bearing member 35 and the driving side cartridge cover member 724, there are provided, in the order named in the direction from the bearing member 35 toward the driving side cartridge cover member 724, the idler gear 68, a spring 70 which is an elastic member as an urging member, the downstream drive transmission member 571 as a second coupling member, a disconnecting cam 772 which is a part of a disconnecting mechanism and which is an operating member, and the upstream drive transmission member 474 as a first coupling member. These members are coaxial with the upstream drive transmission member 474, In this embodiment, the drive connecting portion comprises the spring 70, the downstream drive transmission member 571, the disconnecting cam 772, upstream drive transmission member 474, the driving side cartridge cover member 724, and the bearing member 745 fixed to the one longitudinal end portion of the developing device frame 29. They will be described in detail.

104371 The other bearing member 35 rotatably supports the idler gear 68. In more detail, the first shaft receiving portion 35p (cylindrical outer surface) the other bearing member 35 rotatably supports a supported portion 68p (cylindrical inner surface) of the idler gear 68 (Figures 78 and 79).

104381 Figure 82 shows a relation between the disconnecting cam 772 as a coupling releasing member and the driving side cartridge cover member 724.

The disconnecting cam 772 has a substantially ring configuration, and has an outer peripheral surface 772i as a second guided portion, wherein the driving side cartridge cover member 724 has an inner peripheral surface 724i as a part of a second guide portion. The inner peripheral surface 724i is engageable with the outer peripheral surface 772i. In addition, the outer peripheral surface 772i of the disconnecting cam 772 and the inner peripheral surface 724i of the driving side cartridge cover member 724 are co-axial with the rotational center X. More particularly, the disconnecting cam 772 is slidable in the axial direction relative to the driving side cartridge cover member 724 and the developing unit 9, and is also slidable in the rotational moving direction (rotatable) about the axis X. 104391 The disconnecting cam 772 as the coupling releasing member is provided with a contact portion (inclined surface the 772a as a force receiving portion, and the driving side cartridge cover member 724 is provided with a contact portion (inclined surface the 724b as an operating portion. Here, the contact portion 772a of the disconnecting cam 772 and the contact portion 724b of the driving side cartridge cover member 724 are contactable to each other.

Figure 83 shows structures of the drive connecting portion, the driving side cartridge cover member 724 and the bearing member 745, The bearing member 745 is provided with a regulating portion 745d as a part of the second guide portion. The regulating portion 745d is engaged with the force receiving portion 772b functioning second guided portion of the disconnecting cam 772 is held between the driving side cartridge cover member 724 and the other bearing member 35. By the engagement between the regulating portion 745d and the force receiving portion 772b, the disconnecting cam 772 is prevented in the relative movement around axis X relative to the bearing member 745 and the developing unit 9. Figure 84 is a sectional view of the drive connecting portion.

[044t] The cylindrical portion 68p of the idler gear 68 and the first shaft receiving portion 35p (cylindrical outer surface) of the other bearing member 35 are engaged with each other. The cylindrical portion 68q of the idler gear 68 and the inside circumference 724q of the driving side cartridge cover member 724 are engaged with each other, That is, the idler gear 68 is rotatably supported at the opposite end portions thereof by the other bearing member 35 and the driving side cartridge cover member 724.

104421 In addition, by the engagement between the cylindrical portion 474p of the upstream drive transmission member 474 and the hole portion 724p of the driving side cartridge cover member 724 with each other, the upstream drive transmission member 474 is supported rotatably relative to the driving side cartridge cover member 724.

104431 Furthermore, the first shaft receiving portion 35p (cylindrical outer surface) of the other bearing member 35, the inside circumference 724q of the driving side cartridge cover member 724, and the hole portion 724p are co-axial with the rotational center X of the developing unit 9. That is, the upstream drive transmission member 474 is supported rotatably about the rotational center X of the developing unit 9. Similarly to the foregoing embodiments, the cylindrical portion 474m of the upstream drive transmission member 474 and the hole portion 571m of the downstream drive transmission member 571 are engaged with each other (Figure 60). By doing so, as a result, the downstream drive transmission member 571 is also supported rotatably about the rotational center X is of the developing unit 9, [0444] Part (a) of Figure 84 is a sectional view of the drive connecting portion, in which the claw 571a of the downstream drive transmission member 571 and the claw 474a of the drive input coupling 474 are engaged with each other. Part (b) of Figure 84 is a sectional view of the drive connecting portion in which the claws 571a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are spaced from each other.

[0445] [Drive disconnecting operation] [0446] The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described, [State fl 104471 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 745a of the bearing member 745 are spaced by a gap d. At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state F' of the main assembly spacing member 80.

Part (a) of Figure 85 schematically shows the drive connecting portion at this time. Part (b) of Figure 85 is a perspective view of the drive connecting portion.

In Figure 85, some parts are omitted for better illustration. In addition, in part (a) of Figure 85, a pair of the upstream drive transmission member 474 and the downstream drive transmission member 571, and a pair of the disconnecting cam 772 and the driving side cartridge cover member 724 are separately shown. In part (b) of Figure 85, only a part of the driving side cartridge cover member 724 including the contact portion 724b, and only a part of the bearing member 745 including the regulating portion 745d are shown, Between the contact portion 772a of the disconnecting cam 772 and the contact portion 724b of the cartridge cover member 724, there is a gap e. In addition, at this time, the claw 474a of the upstream drive transmission member 474 and the claw 571a of the downstream drive transmission member 571 are engaged with each other by an engagement depth q, so that the drive transmission is possible (part (a) of Figure 85). In addition, as described above, the downstream drive transmission member 571 engages with the idler gear 68 (Figure 59), Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly of the apparatus 2 is transmitted to the idler gear 68 and the developing roller gear 69 through the downstream drive transmission member 571. By this, the developing roller 6 is driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 2j 104481 When the main assembly spacing member 80 moves in the direction indicated by an arrow Fl by b I in the Figure from the development contact and drive transmission state, as shown in part (b) of Figure 7, the developing unit 9 rotates about the rotation axis X in the direction of an arrow K by an angle 0 1 As a result, the developing roller 6 is spaced from the dmm 4 by a distance F 1.

The bearing member 745 in the developing unit 9 rotates in the direction of an arrow K by an angle 6 1 in interrelation with the rotation of the developing unit 9, On the other hand, the disconnecting cam 772 is in the drum unit 8, but as shown in Figure 83, the force receiving portion 772b is engaged with the engaging portion 745d of the bearing member 745, Therefore, in interrelation with the rotation of the developing unit 9, the disconnecting cam 772 rotates in the direction of the arrow K inside the drum unit 8. As shown in part (a) the Figure 86 and part (b) of Figure 86, the contact portion 772a of the disconnecting cam 772 and the contact portion 724b of the driving side cartridge cover member 724 start to contact with each other. At this time, the claw 474a of the upstream drive transmission member 474 and the claw 57a of the downstream drive transmission member 571 are kept engaged with each other. Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the downstream drive transmission member 57],the idler gear 68 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state.

[State 3j [0449] Part (a) of Figure 87 and part (b) of Figure 87 show the drive connecting portion when the main assembly spacing member 80 moves from the developing device spacing and drive transmission state in the direction of the arrow Fl only 3 2 in the Figure as shown in part (c) of Figure 7. In interrelation with the rotation of the developing unit 9 by angle 6 2 (>6 1), the bearing member 745 is rotated. At this time the contact portion 772a of the disconnecting cam 772 receives a reaction force from the contact portion 724b of the driving side cartridge cover member 724. As described above, the force receiving portion 772b of the disconnecting cam 772 engages with the engaging portion 745d of the bearing member 745 so that it is movable only in the axial direction (arrows M and N) relative to the developing unit 9 (Figure 83). Therefore, as a result, the disconnecting cam 772 slides in the direction of the arrow N by a movement distance p. In interrelation with the movement of the disconnecting cam 772 in the direction of the arrow N, an urging surface 772c, as the urging portion, of the disconnecting cam 772 urges the urged surface 571c, as the portion-to-be-urged, of the downstream drive transmission member 571. By this, the downstream drive transmission member 571 slides in the direction of the arrow N against an urging force of the spring 70 by the movement distance p. 104501 At this time, the movement distance p is larger than the engagement is depth q between the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571, and therefore, the claws 474a and the claws 57] a are disengaged from each other.

Then, since the upstream drive transmission member 474 receives the driving force from the main assembly 2 of the apparatus, it continues to rotate, and on the other hand, the downstream drive transmission member 571 stops. As a result, the rotations of the idler gear 68, the developing roller gear 69 and the developing roller 6 stop, The state of the parts is a spacing position, or a developing device spacing and drive disconnection state.

104511 In the manner described above, the drive for developing roller 6 is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 can space from the drum 4 while rotating, so that the drive to the developing roller 6 can be stopped in accordance with the spacing distance between the developing roller 6 and the drum 4.

[Drive connecting operationj 104521 Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

104531 In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 6 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are in a disconnected state, as shown in Figure 87.

104541 In the angle 6 1 position of the developing unit 9 (the state shown in is part (b) of Figure 7 and Figure 86) by gradual rotation of the developing unit 9 in the direction of the arrow H shown in Figure 7 from this state, the claws 474a of the upstream drive transmission member 474 and the claws 57 a of the downstream drive transmission member 571 are engaged with each other by the movement, in the direction of the arrow M, of the downstream drive transmission member 571 by the urging force of the spring 70. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

104551 By further rotating the developing unit 9 gradually in the direction of the arrow H shown in Figure 7, the developing roller 6 can be contacted to the drum 104561 The foregoing is the explanation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow H. With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmitted to the developing roller 6 depending on the spacing distance between the developing roller 6 and the drum 4, [0457] In the foregoing, the force receiving portion 772b of the disconnecting cam 772 is engaged with the regulating portion 745d of the bearing member 745, but this is not inevitable, and it may be engaged with the developing device frame

29, for example.

ic [0458] As in this embodiment, the upstream drive transmission member 474 as the first coupling member aiid the downstream drive tnmsmission member 571 as the second coupling member may be provided on the drum unit 8.

[Embodiment 8] is [0459] A cartridge according to an eighth embodiment of the invention will be described. In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted.

[Structure of the developing unit] [0460] As shown in Figures 88 and 89, the developing unit 9 comprises a developing roller 6, a developing blade 31, a developing device frame 29, a bearing member 845, a developing device covering member 632 and so on.

104611 In addition, as shown in Figure 88, the bearing member 845 is fixed to one longitudinal end portion of the developing device frame 29. The bearing member 845 rotatably supports the developing roller 6. The developing roller 6 is provided with a developing roller gear 69 at a longitudinal end portion. Also, the bearing member 845 rotatably supports an idler gear 68 as a third drive transmission member for transmitting the driving force to the developing roller gear 69.

104621 In addition, there is provided a downstream drive transmission member 571 and so on as the drive connecting portion for transmifting the drive to the idler gear 68 in the proper order.

104631 The developing device covering member 632 is fixed to an outside of the bearing member 845 with respect to the longitudinal direction of the cartridge P. The developing device covering member 632 covers the developing roller gear 69, the idler gear 68, an upstream drive transmission member 474 as the first drive transmission member, a downstream drive transmission member 571 as the second drive transmission member. As shown in Figures 88 and 89, the developing device covering member 632 is provided with a cylindrical portion 632b. The cylindrical portion 632b is provided with an inside opening 632d through which the drive inputting portion 474b of the upstream drive transmission member 474 is exposed. When the cartridge P (PY, PM, PC, PK) is is mounted to the main assembly 2 of the apparatus, the drive inputting portion 474b engages with the developing device-drive output member 62 (62Y, 62M, 62C, 62K) shown in part (b) of Figure 3 to transmit the driving force from the driving motor (unshown) provided in the main assembly 2 of the apparatus.

That is, the upstream drive transmission member 474 functions as a development input coupling. Therefore, the driving force inpufted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller gear 69 and the developing roller 6 through the idler gear 68. The stmctures of a drive connecting portion will be described in detail hereinafter.

[Assembling of the drum unit and the developing unit] 104641 As shown in Figures 90 and 91, when the developing unit 9 and drum unit 8 are connected with each other, an outside circumference 632a of a cylindrical portion 632b of the developing device covering member 632 is engaged with a supporting portion 824a of the driving side cartridge cover member 824 at one end portion side of-the cartridge P. At the other end portion side of-the of the cartridge P, a projected portion 29b projected from the developing device frame 29 is engaged into a supporting hole portion 25a of the non-driving side cartridge cover member. By this, the developing unit 9 is supported rotatably relative to the drum unit 8. Here, the rotational center of the developing unit 9 relative to the drum unit is called "rotational center X". The rotational center Xis an axis resulting the center of the supporting hole portion 824a and the center of the supporting h&e portion 25a.

[Structure of the drive connecting portionj 104651 Referring to Figures 88 and 89, the structure of the drive connecting portion will be described.

104661 The general arrangement thereof will be described, first.

104671 Between the bearing member 845 and the driving side cartridge cover member 824, there are provided, in the order named in the direction from the bearing member 845 toward driving side cartridge cover member 824, the idler gear 68, a spring 70 which is an elastic member as an urging member, the downstream drive transmission member 57] as the second drive transmission member, a disconnecting cam 872 as a coupling releasing member which is a part of a disconnecting mechanism, a disconnecting lever 73 as an operating member (rotatable member) which is a part of the disconnecting mechanism, and the developing device covering member 632, the upstream drive transmission member 474 as the first drive transmission member, These members are coaxial with the upstream drive transmission member 474. This embodiment, the drive connecting portion comprises the idler gear 824, the spring 70, the downstream drive transmission member 571, the disconnecting cam 872, the disconnecting lever 73, the upstream drive transmission member 474, the developing device covering member 632 and the driving side cartridge cover member 824. They will be described in detail, 104681 The bearing member 845 rotatably supports the idler gear 68 as the third drive transmission member. Tn more detail, the first shaft receiving portion 845p (cylindrical outer surface) of the bearing member 845 rotatably supports a supported portion 68p (cylindrical inner surface) of the idler gear 68 (Figures 88, 89).

104691 Furthermore, the bearing member 845 rotatably supports the developing roller 6. In more detail, the second shaft receiving portion 845q (cylindrical inner surface) of the bearing member 845 rotatably supports a shaft portion 6a of the developing roller 6.

104701 The shaft portion 6a of the developing roller 6 is fitted into the developing roller gear 69. By doing so, the rotational force is transmitted to the is developing roller 6 through the developing roller gear 69 from the idler gear 68.

104711 Figure 92 shows structures of the upstream drive transmission member 474 as the first drive transmission member and the downstream drive transmission member 571 as the second drive transmission member. In addition, the downstream drive transmission member 57! is provided with a hole portion 571m at the center portion. The hole portion 571m engages with a small diameter cylindrical portion 474m of the upstream drive transmission member 474. By doing so, the downstream drive transmission member 571 is supported slidably relative to the upstream drive transmission member 474 (rotatable and slidable along the axes).

104721 Here, as shown in Figures 88 and 89, the disconnecting cam 872 is disposed between the downstream drive transmission member 571 and the upstream drive transmission member 474. As described above, the disconnecting cam 872 has a substantially ring configuration, and has an outer peripheral surface 872i, and the developing device covering member 632 is provided with an inner peripheral surface 632i (Figure 51), The inner peripheral surface 632i is engageable with the outer peripheral surface 872i, By doing so, the disconnecting cam 872 is slidable relative to the developing device covering member 632 (slidahle in parallel with the axis of the developing roller 6).

[0473] The developing device covering member 632 is provided with a guide 632h as a second guide portion, and the disconnecting cam 872 is provided with a guide groove 872h as a second guided portion. Here, the guide 632h and the ic guide groove 872h are in parallel with the axial direction (arrows NI and N).

Here, the guide 632h of the developing device covering member 632 is engaged with the guide groove 872h of the disconnecting cam 872. By the engagement between the guide 632h and the guide groove 872h, the disconnecting cam 872 is slidable relative to the developing device covering member 632 only in the axial is direction (arrows Ni and N).

[0474] Figure 93 is a sectional view of the drive connecting portion.

[0475] A cylindrical portion 68p (cylindrical outer surface) of the idler gear 68 and the first shaft receiving portion 845p (cylindrical inner surface) of the bearing 845 are engaged with each other. In addition, the cylindrical portion 68q of the idler gear 68 and the inside circumference 632q of the developing device covering member 632 are engaged with each other. That is, the idler gear 68 is rotatably supported at the opposite end portions by the bearing member 845 and the developing device covering member 632.

[0476] In addition, a cylindrical portion 474k (the other end portion side supported portion) of the upstream drive transmission member 474 which has a small diameter and the hole portion 68k (the other end portion side supporting portion) of the idler gear 68 are rotatably engaged with each other (Figure 93).

Also, a cylindrical portion 474p (one end portion side supported portion) of the upstream drive transmission member 474 and a hole portion 632p (one end portion side supporting portion) of the developing device covering member 632 are rotatably engaged with each other. That is, the upstream drive transmission member 474 is rotatably supported at the opposite end portions thereof by the idler gear 68 and the developing device covering member 632.

[0477] Here, the cylindrical portion 474k is provided at a free end of a shaft portion 74m, and the cylindrical portion 474p is provided between the drive inputting portion 474b and the claw portion 474a, 0 [0478] In addition, the cylindrical portion 474p is frirther from the rotational axis X than the claw portion 474a in a radial direction of rotation of the upstream drive transmission member 474.

[0479] The cylindrical portion 474p is further from the rotational axis X than the drive inputting portion 474b in the radial direction of rotation of the upstream is drive transmission member 474, [0480] Furthermore, the first shaft receiving portion 845p (cylindrical inner surface) of the bearing member 845, the inside circumference 632q of the developing device covering member 632 and the hole portion 632p are co-axial with the rotational center X of the developing unit 9. That is, the upstream drive transmission member 474 is supported rotatably about the rotational center X of the developing unit 9. As described above, the cylindrical portion 474m of the upstream drive transmission member 474 and the hole portion 571m of the downstream drive transmission member 571 are engaged with each other (Figure 92). By doing so, as a result, the downstream drive transmission member 57] is also supported rotatably about the rotational center X of the developing unit 9.

[0481] A guided surface 73s of the disconnecting lever 73 is contacted to a guiding surface 474s of the upstream drive transmission member 474. By this, the disconnecting lever 73 is limited in the movement in the direction of the axis x.

104821 Part (a) of Figure 93 is a sectional view of the drive connecting portion illustrating a state in which the claws 571a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are engaged with each other. Part (b) of Figure 93 is a sectional view of the drive connecting portion in which the claws 57]a of the downstream drive transmission member 571 and the claws 474a of the upstream drive transmission member 474 are spaced from each other. Here, at least a part of the disconnecting lever 73 is between the downstream drive transmission member 571 and the upstream drive transmission member 474.

104831 Figure 94 shows constitutes of the disconnecting cam 872 and the disconnecting lever 73, The disconnecting cam 872 as the coupling releasing member includes a contact portion 872a as a force receiving portion (portion-to-is be-urged and a cylindrical inner surface 872e. Here, the contact portion 872a is inclined relative to the rotational axis X (parallel with rotational axis of the developing roller 6). In addition, the disconnecting lever 73 is provided with a contact portion 73a as an urging portion and an outer peripheral surface 73e.

Here, the contact portion 73a is inclined to rotational axis X. 104841 The contact portion 73a of the disconnecting lever 73 is contactable to the contact portion 872a of the disconnecting cam 872. In addition, the cylindrical inner surface 872e of the disconnecting cam 872 and the outer peripheral surface 73e of the disconnecting lever 73 are slidably engaged with each other. Furthermore, the outer peripheral surface 872i and the cylindrical inner peripheral surface 872e of the disconnecting cam 872, and the outer peripheral surface 73e of the disconnecting lever 73 are co-axial with each other.

Here, as described above, the outer peripheral surface 872i of the disconnecting cam 872 engages with the inner peripheral surface 632i of the developing device covering member 632 (Figure 51). The outer peripheral surface 872i of the disconnecting cam 872 and the inner peripheral surface 632i of the developing device covering member 632 are co-axial with the rotational center X. In other words, the disconnecting lever 73 is supported through the disconnecting cam 872 and the developing device covering member 632 and is rotatably about the rotational center X relative to the developing unit 9 (developing device frame 29).

[0485] Here, the disconnecting lever 73 is provided with a ring portion 73j having a substantially ring configuration. The ring portion 73j includes the contact portion 73a and the outer peripheral surface 73e. Furthermore, the disconnecting lever 73 is provided with a force receiving portion 73b as a projected portion projected from the ring portion 73j radially outwardly of the ring portion 73j.

104861 Figure 95 shows structures of the drive connecting portion and the driving side cartridge cover member 824. The disconnecting lever 73 is provided with the force receiving portion 73b. The force receiving portion 73b engages with the regulating portion 824d of the driving side cartridge cover member 824 to receive a force from the driving side cartridge cover member 824 (a part of the photosensitive member frame). The force receiving portion 73b projects through an opening 632c provided in a part of a cylindrical portion 632b of the developing device covering member 632 to be engageable with the regu'ating portion 824d of the driving side cartridge cover member 824. By the engagement between the regulating portion 824d and the force receiving portion 73b, the disconnecting cam 73 is prevented in the relative movement about the axis X relative to the driving side cartridge cover member 824.

[0487] Part (a) of Figure 96 is a perspective view of the cartridge P schematically showing the force applied to the developing unit 9, and part (b) Figure 96 is a side view of a part as seen in the direction along the axis X. 104881 To the developing unit 9, a reaction forced QI applied from the urging spring 95, a reaction force Q2 applied from the drum 4 through the developing roller 6, and the weight Q3 thereof and soon are applied. In addition, upon the drive disconnecting operation, the disconnecting lever 73 receives a reaction force Q4 by engagement with the driving side cartridge cover member 824, as will be described in detail hereinafter, The resultant force QO of the reaction forces QI, Q2 and Q4 and the weight Q3 is applied to supporting hole portions 824a, 25a of the driving side rotatably supporting the developing unit 9 and non-driving side cartridge cover members 824 and 25.

104891 Therefore, when the cartridge P is seen along the axial direction ((b) of Figure 96), a sliding portion 824a of the driving side cartridge cover member 824 contacting the developing device covering member 632 is necessary with respect to the direction of the resultant force QO. On the other hand, with respect to the is direction other than the direction of the resultant force QO, the cylindrical portion 632b of the developing device covering member 632 or the sliding portion 824a of the driving side cartridge cover member 824 is not inevitable, In this embodiment in view of these, an opening 632c which opens in the direction different from that of the resultant force QO is provided in a part of the cylindrical portion 632b sliding relative to the driving side cartridge cover member 824 of the developing device covering member 632. The disconnecting lever 73 for engaging with the regulating portion 824d of the driving side cartridge cover member 824 is through the opening 632c.

[Drive disconnecting operation] [0490] The operation of the drive connecting portion at the time of change from the contact state to the spaced state between the developing roller 6 and the drum 4 will be described.

[State Ij 104911 As shown in part (a) of Figure 7, the main assembly spacing member 80 and the force receiving portion 845a of the bearing member 845 are spaced by a gap d. At this time, the drum 4 and the developing roller 6 contact to each other.

This state will be called "state I" of the main assembly spacing member 80.

Part (a) of Figure 97 schematically shows the drive connecting portion at this time, Part (b) of Figure 97 is a perspective view of the drive connecting portion.

In Figure 97, some parts are omitted for better illustration. In part (a) of Figure 97, a pair of the upstream drive transmission member 474 and the downstream drive transmission member 571, and a pair of the disconnecting cam 872 and the disconnecting lever 73 are shown separately. In part (b) of Figure 97, only a part of the developing device covering member 632 which include is guide 632h is shown. Between the contact portion 872a of the disconnecting cam 872 and the contact portion 73a of the disconnecting lever 73, there is a gap e. At this time, the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571 are engaged with each other by an engagement depth q. In addition, as described above, the downstream drive transmission member 571 engages with the idler gear 68 (Figure 59), Therefore, the driving force inputted to the upstream drive transmission member 474 at main assembly 2 of the apparatus is transmitted to the idler gear 68 through the downstream drive transmission member 571. By this, the developing roller gear 69 and the developing roller 6 are driven. The positions of the parts at this time is called a contacting position, a development contact and drive transmission state.

[State 21 104921 When the main assembly spacing member 80 moves in the direction of an arrow F 1 only ô 1 in the Figure from the development contact and drive transmission state (part (b) of Figure 7), the developing unit 9 rotates in the direction of an anow K only an angle 6 1 about the rotational center X, as described hereinbefore, As a result, the developing roller 6 is spaced from the drum 4 by a distance 1. The disconnecting cam 872 and the developing device covering member 632 in the developing unit 9 rotate in the direction indicated by the arrow K by an angle 6 1 in interrelation with the rotation of the developing unit 9. On the other hand, the disconnecting lever 73 is provided in the developing unit 9, but as shown in Figure 95, the force receiving portion 73b is engaged with the engaging portion 824d of the driving side cartridge cover member 824. Therefore, the force receiving portion 73b does not move in interrelation with the rotation of the developing unit 9, and does not change the position thereof That is, the disconnecting lever 73 receives the reaction force from the engaging portion 824d of the driving side cartridge cover member 824 to make a relative movement (rotation) relative to the developing unit 9. Part is (a) of Figure 98 schematically shows the drive connecting portion at this time.

Part (b) of Figure 98 is a perspective view of the drive connecting portion. In the state shown the Figure, the disconnecting cam 872 rotates in the direction of the arrow IC in the Figure in interrelation with the rotation of the developing unit 9, and the contact portion 872a of the disconnecting cam 872 and the contact portion 73a of the disconnecting lever 73 start to contact with each other. At this time, the claw 474a of the upstream drive transmission member 474 and the claw 571a of the downstream drive transmission member 571 are kept engaged with each other. Therefore, the driving force inputted to the upstream drive transmission member 474 from the main assembly 2 of the apparatus is transmitted to the developing roller 6 through the downstream drive transmission member 57], the idler gear 68 and the developing roller gear 69. The state of these parts in this state is called a developing device spacing and drive transmission state. In the state 1, it is not inevitable that the force receiving portion 73b contacts the engaging portion 824d of the driving side cartridge cover member 824. More particularly, in the state I, the force receiving portion 73b may be spaced from the engaging portion 824d of the driving side cartridge cover member 824. In this case, in the process of shifting operation from the state Ito the state 2, the gap between the force receiving portion 73b and the engaging portion 824d of the driving side cartridge cover member 824 disappears, that is, the force receiving portion 73b is brought into contact to the engaging portion 824d of the driving side cartridge cover member 824.

[State 31 104931 Figure 99 shows the state of the drive connecting portion at this time when the main assembly spacing member 80 moves in the direction of the arrow Fl in the Figure by b 2 from the developing device spacing and drive transmission state (part (c) of Figure 7). In interrelation with the rotation of the developing unit 9 by the angle 8 2 (>8 1), the disconnecting cam 872 and the developing device covering member 632 rotate. On the other hand, the disconnecting lever 73 does not change the position thereof, similarly to the above-described case, but the disconnecting cam 872 rotates in the direction of the arrow IC in the Figure.

At this time, the contact portion 872a of the disconnecting cam 872 receives a reaction force from the contact portion 73a of the disconnecting lever 73, In addition, as described above, the guide groove 872h of the disconnecting cam 872 is limited by engaging with the guide 632h of the developing device covering member 632 to be movable only in the axial direction (arrows M and N) (Figure 51). Therefore, as a result, the disconnecting cam 872 slides in the direction of the arrow N by a movement distance p. In interrelation with the movement of the disconnecting cam 872 in the direction of the arrow N, an urging surface 872c, as the urging portion, of the disconnecting cam 872 urges the urged surface 571c, as the portion-to-be-urged, of the downstream drive transmission member 571.

By this, the downstream drive transmission member 571 slides in the direction of the arrow N against an urging force of the spring 70 by the movement distance p. [0494] At this time, the movement distance p is larger than the engagement depth q between the claws 474a of the upstream drive transmission member 474 and the claws 571a of the downstream drive transmission member 571, and therefore, the claws 474a and the claws 57] a are disengaged from each other.

[0495] In the manner described above, the drive for developing roller 6 is is disconnected in interrelation with the rotation of the developing unit 9 in the direction of the arrow K. With such structures, the developing roller 6 can space from the drum 4 while rotating, so that the drive to the developing roller 6 can be stopped in accordance with the spacing distance between the developing roller 6 andthe drum 4, [Drive connecting operationj [0496] Then, the description will be made as to the operation of the drive connecting portion when the developing roller 6 and the drum 4 change from the spacing state to the contacting state. The operation is the reciprocal of the operation from the above-described development contact state to the spaced-developing-device-state.

[0497] In the spaced-developing-device-state (the state in which the developing unit 9 is in the angle 6 2 position as shown in part (c) of Figure 7), the drive connecting portion is in the state in which the claws 474a of the upstream drive transmission member 474 and the claws 571 a of the downstream drive transmission member 571 are in a disconnected state, as shown in Figure 99.

104981 When the developing unit 9 is gradually rotated from this state in the direction of an arrow H shown in Figure 7, the state in which the developing unit 9 is rotated only the angle 6 1 results (the state shown in part (b) of Figure 7 and Figure 98), the downstream drive transmission member 571 is moved in the direction of the arrow M by the urging force of the spring 70. By this, the claw 474a of the upstream drive transmission member 474 and the claw 571a of the downstream drive transmission member 571 are brought into engagement with each other. By this, the driving force from the main assembly 2 is transmitted to the developing roller 6 to rotate the developing roller 6. At this time, the developing roller 6 and the drum 4 are still in the spaced state from each other.

104991 By thi-ther rotating the developing unit 9 gradually in the direction of the anow H shown in Figure 7, the developing roller 6 can be contacted to the drum 4.

105001 The foregoing is the explanation of the operation of the drive transmission to the developing roller 6 in interrelation with rotation of the developing unit 9 in the direction of the arrow I-I, With such structures, the developing roller 6 is brought into contact to the drum 4 while rotating, and the drive can be transmitted to the developing rofler 6 depending on the spacing distance between the developing roller 6 and the drum 4, 105011 As described in the foregoing, according to the structures, the drive disconnection state and the drive transmission state to the developing roller 6 are determined firmly by the rotation angle of the developing unit 9.

105021 In the foregoing, the contact portion 872a of the disconnecting cam and the contact portion 73a of the disconnecting lever 73 make face-to-face contact with each other, but this is not inevitable. For example, the contact may be between a surface and a ridge line, between a surface and a point, between a ridge line and a ridge line or between a ridge line and a point. In addition, in the foregoing, the force receiving portion 73b of the disconnecting lever 73 engages with the regulating portion 824d of the driving side cartridge cover member 824, but this is not inevitable, and it may be engaged with the cleaner container 26, for

example.

[0503] In this embodiment, the developing unit 9 comprises the disconnecting lever 73 and the disconnecting cam 872. The disconnecting lever 73 is rotatable about the axis X relative to the developing unit 9, and is not slidable in the axial direction M or N. On the other hand, the disconnecting cam 872 is slidable in the axial directions NI and N relative to the developing unit 9, but is not rotatable about the axis X. Thus, no member that makes a three-dimensional relative movement including the rotation about the rotational center X relative to the is developing unit 9 and the sliding motion in the axial directions Ni and N is provided. In other words, the moving directions of the parts are assigned separately to the disconnecting lever 73 and the disconnecting cam 872. By this, the movement of the parts are two-dimensional, and therefore, the operations are stabilized, As a result, the drive transmission operation to the developing roller 6 in interrelation with the rotation of the developing unit 9 can be carried out smoothly.

[0504] Figure 100 is a schematic view illustrating a positional relation among the disconnecting cam, the disconnecting lever, the downstream drive transmission member, the upstream drive transmission member with respect to the axial direction.

[0505] Part (a) of Figure 100 shows the structure of this embodiment, in which a disconnecting cam 8072 and a disconnecting lever 8073 as the coupling releasing member which is a part of the disconnecting mechanism is provided between a downstream drive transmission member 8071 and a drive transmission member 8074. The upstream drive transmission member 37 and the downstream drive transmission member 38 are engaged through an opening 8072f of the disconnecting cam 8072 and an opening 8073f of the disconnecting lever 8073. Upon the drive disconnection, an urging surface 8072c as the urging portion of the disconnecting cam 8072 urges an urged surface 8071c as a portion-to-be-urged of the downstream drive transmission member 8071.

Simultaneously, an urging surface 8073c as the urging portion of the disconnecting lever 8073 urges the urged surface 8074c as the portion-to-be-urged of the upstream drive transmission member 8074. That is, the disconnecting cam 8072 relatively urges the downstream drive transmission member 8071 in the direction of the arrow N, and the disconnecting lever 8073 relatively urges the upstream drive transmission member 8074 in the direction of is the arrow M, by which the downstream drive transmission member 807! and the upstream drive transmission member are separated from each other to disconnect the drive transmission in the direction of arrows N'l and N. 105061 On the other hand, part (b) of Figure 100 shows a structure different from the foregoing example, and various parts are slidably supported by a shaft 44 which is rotatable about the axis. Specifically, the disconnecting lever 8173 is supported slidably relative to the shaft 44. On the other hand, the upstream drive transmission member 8174 is supported rotatably, and is rotatable integrally with the shaft 44. For example, a pin 47 fixed to the shaft 44 and a groove 81 74t provided in the upstream drive transmission member 8174 are engaged with each other, by which the upstream drive transmission member 8174 and the shaft 44 are fixed. The downstream drive transmission member 8171 is supported slidably relative to the shaft 44. The upstream drive transmission member 37 and the downstream drive transmission member 38 are engaged with each other through an opening 8172f of the disconnecting cam 8172 as the coupling releasing member. In addition, the shaft 44 is provided with a ring member 46 rotatable integral with the shafi. The ring member 46 functions to retain the disconnecting lever 8173 in the direction of the arrow M. Upon the drive disconnection with the above-described structure, the contact portion 8172a functioning force receiving portion of the disconnecting cam 8172 and the contact portion 8173a of the disconnecting lever 8173 are contacted to each other, first. Then, a gap exists between the disconnecting lever 8173 and the ring member 8173 in the axis M and N direction, the disconnecting lever 8173 moves in the direction of the arrow M to abut to the ring member 46. By this, the disconnecting lever 8173 is positioned relative to the shaft 44 with respect to the arrow M and N direction, Subsequently, in accordance with the movement of the disconnecting cam 8172 in the direction of the arrow N, the downstream drive transmission member 8171 moves away from the upstream drive transmission member 8174, by which the drive transmission is disconnected. With such structures, in order to reduce the movement distances of the downstream drive transmission member 8171 and/or the disconnecting cam 8172 in the directions of the arrows M and N for the driving connection and disconnection, or in order to control the driving connection and disconnection timing with high precision, it is desirable to control with high precision the positional accuracy of the ring member 46 fixed to the shaft 44 to position the disconnecting lever 8173 and the positional accuracy between the upstream drive transmission member 8174 and the ring member 46.

[0507] On the other hand, with the structures shown in part (a) of Figure 100, when the upstream drive transmission member 8074 and the downstream drive transmission member 8071 are disconnected from each other, it will suffice if the disconnecting cam 8072 and the disconnecting lever 8073 are provided between the upstream drive transmission member 8074 and the downstream drive transmission member 8071. Therefore, the movement distances of the downstream drive transmission member 8071 and/or the disconnecting cam 8072 S in the directions of the arrows M and N can be reduced, and in addition, the timing of the driving connection and disconnection can be controfled with high precision, and furthermore, the number of parts can be reduced, and the assembling property can be improved.

105081 In Figure 94, the positioning of the disconnecting lever 73 and the disconnecting cam 872 are effected by engagement between the outer peripheral surface 73e of the disconnecting lever 73 and the cylindrical inner peripheral surface 872e of the disconnecting cam 872 as the coupling releasing member.

105091 However, this is not inevitable, and the structure as shown in Figure 101 can be employed. More particularly, an outer peripheral surface 8273e of a disconnecting lever 8273 is supported slidably relative to an inner peripheral surface 8232q of a developing device covering member 8232, and a cylindrical inner surface 872i of a disconnecting cam 8272 is also supported slidably relative to the inner peripheral surface 8232q of the developing device covering member 8232.

[Embodiment 9] 105101 A cartridge by a ninth embodiment of the invention will be described.

In the description of this embodiment, the description of the structures similar to those of the foregoing embodiments will be omitted. The embodiment is similar to the above-described fifth embodiment.

105111 Part(a) of Figure 102 which is a sectional view of a drive connecting portion shows a state in which claws 474a of an upstream drive transmission member 474 as a first drive transmission member and claws 571a of a downstream drive transmission member 571 as a second drive transmission member are engaged with each other. Part (b) of Figure 102 which is a sectional view of the drive connecting portion shows a state in which the claws 474a of the upstream drive transmission member 474 and the claws 571 a of the downstream drive transmission member 571 are separated from each other.

105121 The disconnecting lever 973 projects through an opening 932c provided in a part of the cylindrical portion 932b slidable relative to the driving side cartridge cover member 924 of the developing device covering member 932.

ic The disconnecting lever 973 is provided in a sliding range 924e of a sliding portion 924a which is between the driving side cartridge cover member 924 and the developing unit 9 with respect to the direction of an axis X. 105131 Here, as described hereinbefore, upon the drive disconnecting operation the disconnecting lever 973 receives a reaction force Q4 (Figure 96). A force is receiving portion 973b of the disconnecting lever 93 for receiving the reaction force Q4 is provided in the sliding range 924e of the sliding portion 924a which is between the developing unit 9 is the driving side cartridge cover member 924.

In addition, the disconnecting lever 973 is supported in the sliding range 924e of the sliding portion 924a which is between the developing unit 9 and the driving side cartridge cover member 924. That is, the reaction forced Q4 received by the disconnecting lever 973 is received without deviation in the direction of the axis X by the driving side cartridge cover member 924. Therefore, according to this embodiment, a deformation of the developing device covering member 932 can be suppressed. Because the deformation of the developing device covering member 932 is suppressed, the rotation of the developing unit 9 about the axis X relative to the driving side cartridge cover member 924 can be carried out stably.

Furthermore, because the disconnecting lever 973 is provided in the sliding range 924e of the sliding portion 924a which is between the developing unit 9 and the driving side cartridge cover member 924 in the direction of the axis X, the drive connecting portion and the process cartridge can be downsized, [INDUSTRTAL APPLICABILTTYJ 105141 According to the present invention, a cartridge, a process cartridge and an electrophotographic image forming apparatus in which the drive switching for the developing roller can be effected within the cartridge are provided.

[Reference Numeralsi 1: image forming apparatus 2: main assembly 4: electrophotographic photosensitive drum 5: charging roller 7: cleaning blade 8: drum unit 9: developing unit, developing unit 24: driving side cartridge cover 25: non-driving side cartridge cover 26: cleaner container 27: residual developer accommodating portion 29: developing device frame 31: developing blade 32: developing device covering member 45: bearing 49: developer accommodating portion 68: idler gear 69: developing roller gear 70: spring 71: downstream drive transmission member 72: disconnecting cam 73: disconnecting lever 74: upstream drive transmission member 80: main assembly spacing member 81: rail 95: urging spring

C

Claims

CLAIMS1. A cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said cartridge comprising: (i) a rotatable developing roller for developing a latent image formed on a photosensitive member; (ii) a first drive transmission member capable of receiving a rotational force originated by the main assembly; (iii) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmitting the rotational force received by said first drive transmission member to said developing roller; and (iv) a coupling disconnection member including (iv -i) a force receiving portion capable of receiving the force originated by the main assembly, and (iv-ii) an urging portion capable of urging at least one of said first is drive transmission member and said second drive transmission member by the force received by said force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling.
2. A cartridge according to Claim 1, wherein said coupling disconnection member is movable substantially in parallel with a rotational axis of the developing roller.
3, A cartridge according to Claim 2, further comprising a guide portion for guiding a guided portion of the coupling disconnection member to move said coupling disconnection member substantially in parallel with the rotational axis of the developing roller.
4. A cartridge according to Claim 3, wherein said guide portion and said guided portion extend substantially in parallel with the rotational axis of the developing roller.
5. A cartridge according to any one of Claims 3 or 4, further comprising a cartridge frame which is provided with said guide portion.
6. A cartridge according to any one of Claims 2 -5, wherein by said coupling disconnection member moving substantially in parallel with the rotational axis of the developing roller, at least one of said first drive transmission member and said second drive transmission member is moved substantially in parallel with the rotational axis of the developing roller is 7, A cartridge according to any one of Claims I -6, wherein in a direction parallel with an axis of the developing roller, at least a part of said coupling disconnection member is between said first drive transmission member and said second drive transmission member.8. A cartridge according to any one of Claims I -7, wherein when said coupling disconnection member and said first drive transmission member are projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are coupled, a region of at least apart of said coupling disconnection member overlaps with a region of at least a part of said first drive transmission member.9. A cartridge according to Claim 8, wherein when said coupling disconnection member and said first drive transmission member are projected onto the phantom line in a state that said first drive transmission member and said second drive transmission member are coupled, a region of said coupling disconnection member is in a region of said first drive transmission member.10. A cartridge according to any one of Claims 1 -9, wherein when said coupling disconnection member and said second drive transmission member are projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are coupled, a region of at east a part of said coupling disconnection member overlaps with a region of at least a part of said second drive transmission member.ii. A cartridge according to any one of Claims 1 -10, wherein when said first drive transmission member and said second drive transmission member are is projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are disconnected, a region of at least a part of said first drive transmission member overlaps with a region of at least a part of said second drive transmission member.12. A cartridge according to Claim 11, wherein when said coupling disconnection member and said first drive transmission member are projected onto the phantom line in a state that said first drive transmission member and said second drive transmission member are disconnected, a region of said coupling disconnection member is in a region of said first drive transmission member.13. A cartridge according to any one of Claims 1 -12, wherein in a state that second drive transmission member and said first drive transmission member are disconnected, said second chive transmission member and said first chive transmission member are directly engaged with each other in a coaxial state.14. A cartridge according to any one of Claims 1 -13, wherein said first drive transmission member includes one end portion side supported portion and the other end portion side supported portion rotatably supported one end portion side and the other end portion side of a rotational axis direction of said first drive transmission member.15. A cartridge according to Claim 14, wherein said first drive transmission member provided with a first engaging portion between the one end portion side supported portion and the other end portion side supported portion, and said second drive transmission member is provided with a second engaging portion is engaged with said first engaging portion.16. A cartridge according to Claim l4or 15, further comprising a cartridge frame provided with one end portion side supporting portion tbr rotatably supporting the one end portion side supported portion of said first drive transmission member.17. A cartridge according to Claim 13, wherein said first drive transmission member includes a shaft portion extending along a rotational axis thereof; and said second drive transmission member includes a hole portion extending along a rotational axis thereof; wherein said first drive transmission member and said second drive transmission member are directly engaged by said shaft portion penetrating said hole portion.18. A cartridge according to Claim 17, wherein said first drive transmission member includes a rotational force receiving portion for receiving a rotational force from the main assembly at the one end portion with respect to a rotational axis direction thereoL and is provided with said shaft portion at the other end portion with respect to the rotational axis direction.19. A cartridge according to Claim 18, wherein said first drive transmission member includes a coupling portion for engagement with said second drive transmission member at a position between said rotational force receiving portion and said shaft portion with respect to a direction parallel with the rotational axis of the developing roller.20. A cartridge according to Claim 19, wherein said coupling portion is disposed is at a position remoter from the rotational axis of the first drive transmission member than said shaft portion with respect to a radial direction of said first drive transmission member.21. A cartridge according to Claim 19 or 20, wherein said first drive transmission member is provided with one end portion side supported portion and another end portion side supported portion which are rotatably supported at one end portion side and the other end portion side with respect to the rotational axis direction.22. A cartridge according to Claim 21, wherein said other end portion side supported portion is provided at a free end of the shaft portion, and said one end portion side supported portion is provided between said rotational force receiving portion and said coupling portion.23. A cartridge according to Claim 22, wherein said one end portion side supported portion is disposed at a position remoter from the rotational axis of the first drive transmission member than said coupling portion with respect to a radial direction of said first drive transmission member.24. A cartridge according to Claim 22or 23, wherein said one end portion side supported portion is disposed at a position remoter from the rotational axis of the first drive transmission member than said rotational force receiving portion.C25. A cartridge according to any one of Claims 1 -24, wherein said urging portion of the coupling disconnection member is capable of urging said second drive transmission member to separate said second drive transmission member from said first drive transmission member.26. A cartridge according to Claim 25, frirther comprising a third drive transmission member for transmitting the rotational force received from said second drive transmission member to said developing roller.27. A cartridge according to Claim 26, wherein said third drive transmission member movably supports said second drive transmission member so that said second drive transmission member is capable of moving away from said first drive transmission member.28. A cartridge according to Claim 27, wherein said third drive transmission member has a substantially cylindrical shape, and said second drive transmission member is reciprocable along a rotational axis thereof inside said third drive transmission member, 29. A cartridge according to Claim 28, wherein said third drive transmission member includes a shaft portion extending in parallel with the rotational axis thereot and said second drive transmission member is provided with a hole portion, and wherein said second drive transmission member is reciprocable along said shaft portion in a state that said shaft portion engages with said hole portion.30. A cartridge according to Claim 29, wherein said third drive transmission member receives the rotational force from said second drive transmission member through engagement between said hole portion and said shaft portion.31. A cartridge according to Claim 29or 30, wherein said shaft portion is is provided at each of a plurality of positions around the rotational axis of the third drive transmission member, and said hole portion is provided at each of a plurality of positions around the rotational axis of the second drive transmission member, and wherein said second drive transmission member is reciprocable along said shaft portion in a state that said shaft portions and said hole positions are engaged with each other, respectively.32. A cartridge according to Claim 27, further comprising an elastic member provided between said second drive transmission member and said third drive transmission member, 33. A cartridge according to any one of Claims 28 -3], further comprising an elastic member inside said third drive transmission member, wherein said second drive transmission member is disconnected from said first drive transmission member by moving to an inside of said third drive transmission member against an elastic force of said elastic member, 34. A cartridge according to any one ofClaims26 -33, wherein said third drive transmission member includes a gear portion for transmitting the rotational force to said developing roller, at an outer periphery thereof 35, A cartridge according to Claim 26 -33, wherein said first drive transmission ic member is provided with one end portion side supported portion and another end portion side supported portion which are rotatably supported at one end portion side and the other end portion side with respect to the rotational axis direction.36. A cartridge according to Claim 35, wherein an engaging portion provided is between said one end portion side supported portion and said other end portion side supported portion of said first drive transmission member is engaged with an engaging portion of said second drive transmission member, 37. A cartridge according to Claim 36, further comprising a cartridge frame which is provided with one end portion side supporting portion for rotatably supporting said one end portion side supported portion of said first drive transmission member, 38. A cartridge according to Claim 37, wherein said third drive transmission member is provided with another end portion side supporting portion for rotatably supporting said other end portion side supported portion of said first drive transmission member.39. A cartridge according to any one of Claims I -38, further comprising a developing device frame rotatably supporting said developing roller, and a rotatable member rotatable relative to said developing device frame, wherein said rotatable member includes another urging portion for applying a force to said force receiving portion by rotation thereof.40. A cartridge according to Claim 39, wherein said force receiving portion and said other urging portion are inclined relative to the rotational axis of said developing roller.41. A cartridge according to Claim 40, wherein said force receiving portion and said other urging portion are contacted at positions where they are inclined, also in a state that said cartridge is mounted to said main assembly with said coupling is being in a disconnected state.42. A cartridge according to any one of Claims 39-4], wherein at least a part of said rotatable member is between said first drive transmission member and said second drive transmission member.43. A cartridge according to Claim 42, wherein said rotataNe member has a ring portion having a substantially ring configuration.44, A cartridge according to Claim 43, wherein said rotatable member is provided with a projected portion projected from said ring portion.45. A cartridge according to Claim 44, frirther comprising said photosensitive member, a photosensitive member frame supporting said photosensitive member, wherein said developing device frame is movably connected with said photosensitive member frame so that said developing roller is movable toward and away from said photosensitive member.46. A cartridge according to Claim 45, wherein said projected portion of said rotatable member receives a force from said photosensitive member frame in interrelation with movement of said developing device frame relative to said photosensitive member frame to rotate said rotatable member, 47. A cartridge according to Claim 46, wherein as seen in a direction along the axis of said developing roller, said projected portion of said rotatable member projects from said developing device frame toward said photosensitive member frame.48. A cartridge according to any one of Claims 44 -47, wherein in a state that cartridge is mounted to the main assembly, said projected portion of said rotatable member receives a force from a portion fixed to the main assembly.49, A cartridge according to any one of Claims 39 -44, further comprising said photosensitive member and a photosensitive member frame rotatably supporting said photosensitive member, 50, A cartridge according to Claim 49, wherein in a state that said cartridge is mounted to the main assembly, said photosensitive member frame is fixed to the main assembly, and said developing device frame is movably relative to said photosensitive member frame.51. A cartridge according to Claim 50, wherein said developing roller is capable of moving toward and away from said photosensitive member by said developing device frame moving relative to said photosensitive member frame.52. A cartridge according to Claim 51, wherein said developing device frame is provided with a spacing force receiving portion for receiving from the main assembly a spacing force for spacing said developing roller from said photosensitive member.53, A cartridge according to Claim 52, wherein when said cartridge is seen along the rotational axis of said developing roller, said spacing force receiving portion is projected at a position opposite from said first drive transmission member with respect to said developing roller.54. A cartridge according to Claim 53, wherein said coupling disconnection member and said rotatable member are provided in said developing device frame, and wherein by said spacing force receiving portion receiving the spacing force, said projected portion of said rotatable member receives the force from said photosensitive member frame to rotate said rotatable member.55. A cartridge according to any one of Claims 39 -54, wherein a rotation axis of said rotatable member is substantially coaxial with the rotational axes of said first drive transmission member and said second drive transmission member.56. A cartridge according to any one of Claims I -55, wherein coupling portions of said first drive transmission member and said second drive transmission member are formed such that they are pulled toward each other.57, A cartridge according to any one of Claims Ito 56, wherein coupling portions of said first drive transmission member and said second drive Iransmission member each include two -nine claws.58. A cartridge according to Claim 57, wherein coupling portions of said first drive transmission member and said second drive transmission member each include six claws.59. A cartridge according to any one of Claims 1 -58, wherein said coupling disconnection member includes a ring portion having a substantially ring configuration.is 60. A cartridge according to Claim 59, wherein said ring portion is provided with said urging portion.61. A cartridge according to Claim 60, wherein said urging portion has a surface substantially perpendicular to the rotational axis of said developing roller.62. A cartridge according to any one of Claims 59 -61, wherein said coupling disconnection member has a projected portion projected from said ring portion.63. A cartridge according to Claim 62, wherein said projected portion projects in a direction substantially perpendicular to a phantom surface including said ring portion.64. A cartridge according to Claim 62, wherein said projected portion projects radially outwardly of said ring portion.65. A cartridge according to Claim 62or 63, further comprising a guide portion for guiding a guided portion of said projected portion so that said coupling disconnection member is movable substantially in paraflel with the rotational axis of said developing roller.66. A cartridge according to Claim 65, wherein said guide portion and said guided portion extend substantially in parallel with the rotational axis of the developing roller.67. A cartridge according to Claim 66, further comprising a cartridge frame which is provided with said guide portion.68. A cartridge according to any one of Claims 62 -67, wherein said projected portion is provided with said force receiving portion.69. A cartridge according to Claim 68, wherein said force receiving portion is inclined relative to the rotational axis of said developing roller.70. A cartridge according to any one of Claims 62 -69, wherein said coupling disconnection member includes a plurality of such projected portions.71. A cartridge according to Claim 70, wherein said projected portions are arranged at substantially regular intervals.72. A cartridge according to any one of Claims 62 -69, wherein said coupling disconnection member three of such projected portions.73, A cartridge according to Claim 72, wherein said three projected portions are arranged at substantially regular intervals.74. A cartridge according to any one of Claims I -73, wherein said coupling disconnection member is substantially co-axial with the rotation axes of said first drive transmission member and said second drive transmission member.75. An electrophotographic image forming apparatus capable of image formation on a recording material, said electrophotographic image forming apparatus comprising: (i) a main assembly including a main assembly drive transmission is member and a main assembly urging member; and (ii) a cartridge detachably mountable to said main assembly, said cartridge including, (ii -i) a rotatable developing roller for developing a latent image formed on a photosensitive member; (ii -ii) a first drive transmission member capable of receiving a rotational force originated by said main assembly; (ii -iii) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmitting the rotational force received by said first drive transmission member to said developing roller; and (ii -iv) a coupling disconnection member including (ii-iv -i) a force receiving portion capable of receiving the force originated by the main assembly urging member, arid (ii-iv-ii) an urging portion capable of urging at least one of said first drive transmission member and said second drive transmission member by the force received by said force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling.76. An process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said main assembly including a main assembly drive transmission member and a main assembly urging member, ic said process cartridge comprising: (i) rotatable photosensitive member; (ii) a rotatable developing roller for developing a latent image formed on said photosensitive member, said developing roller being movable toward and away from said photosensitive member; (iii) an urging force receiving portion for receiving an urging force from the main assembly urging member to space said developing roller from said photosensitive member; (iv) a first drive transmission member for receiving a rotational force from the main assembly drive transmission member; (v) a second drive transmission member capable of coupling with said first drive transmission member and capable of transmitting the rotational force received by said first drive transmission member to said developing roller; and (vi) an urging portion capable of urging at least one of said first drive transmission member and said second drive transmission member by the force received by said urging force receiving portion to separate one of said first drive transmission member and said second drive transmission member from the other, thereby disconnecting the coupling 77. A process cartridge according to Claim 76, wherein said coupling disconnection member is movable substarnially in parallel with a rotational axis of the developing roller.78. A process cartridge according to Claim 77, further comprising a guide portion for guiding a guided portion of the coupling disconnection member to move said coupling disconnection member substantially in parallel with the rotational axis of the developing roller.79, A process cartridge according to Claim 78, wherein said guide portion and said guided portion extend substantially in parallel with the rotational axis of the developing roller.80. A process cartridge according to Claim 78 or 79, further comprising a cartridge frame which is provided with said guide portion.81. A process cartridge according to any one of Claims 77 -80, wherein by said coupling disconnection member moving substantially in parallel with the rotational axis of the developing roller, at least one of said first drive transmission member and said second drive transmission member is moved substantially in parallel with the rotational axis of the developing roller.82. A cartridge according to any one of Claims 76-8], wherein in a direction parallel with an axis of the developing roller, at least a part of said coupling disconnection member is between said first drive transmission member and said second drive transmission member.83. A cartridge according to any one of Claims 76-81, wherein when said coupling disconnection member and said first drive transmission member are projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are coupled, a region of at least a part of said coupling disconnection member overlaps with a region of at least a part of said first drive transmission member.84. A process cartridge according to Claim 83, wherein when said coupling disconnection member and said first drive transmission member are projected onto the phantom line in a state that said first drive transmission member and said second drive transmission member are coupled, a region of said coupling disconnection member is in a region of said first drive transmission member.85. A process cartridge according to any one of Claims 76 -84, wherein when said coupling disconnection member and said second drive transmission member are projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are coupled, a region of at least a part of said coupling disconnection member overlaps with a region of at least a part of said second drive transmission member 86. A process cartridge according to any one of Claims 76 -85, wherein when said first drive transmission member and said second drive transmission member are projected onto a phantom line parallel with an axis of said developing roller in a state that said first drive transmission member and said second drive transmission member are disconnected, a region of at least a part of said first drive transmission member overlaps with a region of at least a part of said second drive transmission member, s 87. A process cartridge according to Claim 86, wherein when said coupling disconnection member and said first drive transmission member are projected onto the phantom line in a state that said first drive transmission member and said second drive transmission member are disconnected, a region of said coupling disconnection member is in a region of said first drive transmission member.C88, A process cartridge according to any one of Claims 76 -87, wherein in a state that second drive transmission member and said first drive transmission member are disconnected, said second drive transmission member and said first drive transmission member are directly engaged with each other in a coaxial state.89. A process cartridge according to Claim 88, wherein said first drive transmission member includes one end portion side supported portion and the other end portion side supported portion rotatably supported one end portion side and the other end portion side of a rotational axis direction of said first drive transmission member, 90, A process cartridge according to Claim 89, wherein said first drive transmission member provided with a first engaging portion between the one end portion side supported portion and the other end portion side supported portion, and said second drive transmission member is provided with a second engaging portion engaged with said first engaging portion.91. A process cartridge according to Claim 89or 90, further comprising a cartridge frame provided with one end portion side supporting portion for rotatably supporting the one end portion side supported portion of said first drive transmission member.92. A process cartridge according to any one of Claims 89 -91, wherein said first drive transmission member includes a shaft portion extending along a rotational axis thereof; and said second drive transmission member includes a hole portion extending along a rotational axis thereof, wherein said first drive transmission member and said second drive transmission member are directly engaged by said shaft portion penetrating said hole portion.93, A process cartridge according to Claim 92, wherein said first drive transmission member includes a rotational force receiving portion for receiving a is rotational force from the main assembly at the one end portion with respect to a rotational axis direction thereof, and is provided with said shaft portion at the other end portion with respect to the rotational axis direction.94. A process cartridge according to Claim 93, wherein said first drive transmission member includes a coupling portion for engagement with said second drive transmission member at a position between said rotationa' force receiving portion and said shaft portion with respect to a direction parallel with the rotational axis of said first drive transmission member.95. A process cartridge according to Claim 94, wherein said coupling portion is disposed at a position remoter from the rotational axis of the first drive transmission member than said shaft portion with respect to a radial direction of said first drive transmission member.96. A process cartridge according to Claim 94 or 95, wherein said first drive transmission member is provided with one end portion side supported portion and another end portion side supported portion which are rotatably supported at one end portion side and the other end portion side with respect to the rotational axis direction.97, A process cartridge according to Claim 96, wherein said other end portion ic side supported portion is provided at a free end of the shaft portion, and said one end portion side supported portion is provided between said rotational force receiving portion and said coupling portion.98. A process cartridge according to Claim 97, wherein said one end portion side supported portion is disposed at a position remoter from the rotational axis of the first drive transmission member than said coupling portion with respect to a radial direction of said first drive transmission member.99. A process cartridge according to Claim 97or 98, wherein said one end portion side supported portion is disposed at a position remoter from the rotational axis of the first drive transmission member than said rotational force receiving portion.100. A process cartridge according to any one of Claims 76 -99, wherein said coupling disconnection member is capable of urging said second drive transmission member to separate said second drive transmission member from said first drive transmission member.101 A process cartridge according to Claim 100, further comprising a third drive transmission member for transmitting the rotational force received from said second drive transmission member to said developing roller.102. A process cartridge according to Claim 101, wherein said third drive transmission member movably supports said second drive transmission member so that said second drive transmission member is capable of moving away from said first drive transmission member.ic 103. A process cartridge according to Claim 102, wherein said third drive transmission member has a substantially cylindrical shape, and said second drive transmission member is reciprocable along a rotational axis thereof inside said third drive transmission member.is 104. A process cartridge according to Claim 103, wherein said third drive transmission member includes a shaft portion extending in parallel with the rotational axis thereof and said second drive transmission member is provided with a hole portion, and wherein said second drive transmission member is reciprocable along said shaft portion in a state that said shaft portion engages with said hole portion.105. A process cartridge according to Claim 104, wherein said third drive transmission member receives the rotational force from said second drive transmission member through engagement between said hole portion and said shaft portion.106. A process cartridge according to Claim lO4or 105, wherein said shaft portion is provided at each of a plurality of positions around the rotational axis of the third drive transmission member, and said hole portion is provided at each of a plurality of positions around the rotational axis of the second drive transmission member, and wherein said second drive transmission member is reciprocable along said shaft portion in a state that said shaft portions and said hole positions are engaged with each other, respectively.107. A process cartridge according to Claim 102, further comprising an elastic member provided between said second drive transmission member and said third drive transmission member.108. A process cartridge according to any one of Claims 103 -106, further comprising an elastic member inside said third drive transmission member, wherein said second drive transmission member is disconnected from said first is drive transmission member by moving to an inside of said third drive transmission member against an elastic force of said elastic member.109. A process cartridge according to any one of Claims 101 -108, wherein said third drive transmission member includes a gear portion for transmitting the rotational force to said developing roller, at an outer periphery thereof 110. A process cartridge according to Claim 101 -108, wherein said first drive transmission member is provided with one end portion side supported portion and another end portion side supported portion which are rotatably supported at one end portion side and the other end portion side with respect to the rotational axis direction.iii A process cartridge according to Claim 110, wherein an engaging portion provided between said one end portion side supported portion and said other end portion side supported portion of said first drive transmission member is engaged with an engaging portion of said second drive transmission member.112. A process cartridge according to Claim 111, further comprising a cartridge frame which is provided with one end portion side supporting portion for rotatably supporting said one end portion side supported portion of said first drive transmission member.113. A process cartridge according to Claim t t2, wherein said third drive transmission member is provided with another end portion side supporting portion for rotatably supporting said other end portion side supported portion of said first drive transmission member.114. A process cartridge according to any one of Claims 76 -t t3, further comprising a developing device frame rotatably supporting said developing roller, and a rotatable member rotatable relative to said developing device frame, wherein said rotatable member includes another urging portion for applying a force to said force receiving portion by rotation thereof 115. A process cartridge according to Claim 1 t4, wherein said force receiving portion and said other urging portion are inclined relative to the rotational axis of said developing roller.116. A process cartridge according to Claim 115, wherein said force receiving portion and said other urging portion are contacted at positions where they are inclined, also in a state that said cartridge is mounted to said main assembly with said coupling being in a disconnected state.117. A process cartridge according to any one of Claims 114-116, wherein at least a part of said rotatable member is between said first drive transmission member and said second drive transmission member.118. A process cartridge according to Claim 117, wherein said rotatable member has a ring portion having a substantially ring configuration.119. A process cartridge according to Claim 1t8, wherein said rotatable member is provided with a projected portion projected from said ring portion.120. A process cartridge according to Claim 1 t9, wherein further comprising a is photosensitive member frame supporting said photosensitive member, wherein said developing device frame is movably connected with said photosensitive member frame so that said developing roller is movable toward and away from said photosensitive member.121. A process cartridge according to Claim 120, wherein said projected portion of said rotatable member receives a force from said photosensitive member frame in interrelation with movement of said developing device frame relative to said photosensitive member frame to rotate said rotatable member.122. A process cartridge according to Claim 121, wherein as seen in a direction along the axis of said developing roller, said proj ected portion of said rotatable member projects from said developing device frame toward said photosensitive member frame.123. A cartridge according to any one of Claims 119 -122, wherein in a state that cartridge is mounted to the main assembly, said projected portion of said rotatable member receives a force from a portion fixed to the main assembly.124. A process cartridge according to any one of Claims 114 -123, wherein said developing device frame is provided with said spacing force receiving portion.ic 125. A process cartridge according to Claim 124, wherein when said cartridge is seen along the rotational axis of said developing roller, said spacing force receiving portion is projected at a position opposite from said first drive transmission member with respect to said developing roller.is 126. A process cartridge according to Claim 124 or 125, wherein said coupling disconnection member and said rotatable member are provided in said developing device frame, and wherein by said spacing force receiving portion receiving the spacing force, said projected portion of said rotatable member receives the force from said photosensitive member frame to rotate said rotatable member.127. A process cartridge according to any one of Claims 76 -126, wherein coupling portions of said first drive transmission member and said second drive transmission member are formed such that they are pulled toward each other.128. A process cartridge according to any one of Claims 76 to 127, wherein coupling portions of said first drive transmission member and said second drive transmission member each include two -nine claws.129. A process cartridge according to Claim 128, wherein coupling portions of said first drive transmission member and said second drive transmission member each include six claws.130. A process cartridge according to any one of Claims 76 -129, wherein said coupling disconnection member includes a ring portion having a substantially ring configuration.ic 131. A process cartridge according to Claim 130, wherein said ring portion is provided with said urging portion.132, A process cartridge according to Claim 131, wherein said urging portion has a surface substantially perpendicular to the rotational axis of said developing is roller.133, A process cartridge according to any one of Claims 130-132, wherein said coupling disconnection member has a projected portion projected from said ring portion.134. A process cartridge according to Claim 133, wherein said projected portion projects in a direction substantially perpendicular to a phantom surface including said ring portion.135. A process cartridge according to Claim 133, wherein said projected portion projects radially outwardly of said ring portion.136. A process cartridge according to Claim 133or 134, further comprising a guide portion for guiding a guided portion of said projected portion so that said coupling disconnection member is movable substantially in parallel with the rotational axis of said developing roller.137. A process cartridge according to Claim 136, wherein said guide portion and said guided portion extend substantially in parallel with the rotational axis of the developing roller.ic 138. A process cartridge according to Claim 137, further comprising a cartridge frame which is provided with said guide portion.139. A process caitidge according to any one of Claims 133 -138, wherein said projected portion is provided with said force receiving portion.140. A process cartridge according to Claim 139, wherein said force receiving portion is inclined relative to the rotational axis of said developing roller.14]. A process cartridge according to any one of Claims 133 -140, wherein said coupling disconnection member includes a plurality of such projected portions.142. A process cartridge according to Claim 141, wherein said projected portions are arranged at substantially regular intervals.143. A process cartridge according to any one of Claims 133 -140, wherein said coupling disconnection member three of such projected portions.144. A process cartridge according to Claim 143, wherein said three projected portions are ananged at substantiafly regular intervals.145. An electrophotographic image forming apparatus capable of image formation on a recording material, said electrophotographic image forming apparatus comprising: (i) a main assembly including a spacing force urging member and a main assembly drive transmission member; and (ii) a process cartridge detachably mountable to said main assembly, said process cartridge including, (ii -i) a rotatable photosensitive member, (ii -ii) a developing roller rotatable to develop a latent image formed on said photosensitive member, said developing roller being movable toward and away from said photosensitive member, is (ii -iii) a spacing force receiving portion for receiving a spacing force for spacing said developing roller from said photosensitive member, from said spacing force urging member, (ii -iv) a first drive transmission member for receiving a rotational force from the main assembly drive transmission member, (ii -v) a second drive transmission member capable of connecting with said first drive transmission member to transmit the rotational force received by said first drive transmission member to said developing roller, md (ii -vi) a coupling disconnection member capable of urging at least one of said first drive transmission member and said second drive transmission member to separate one of said first drive transmission member and said second drive transmission member from the other to disconnect the coupling by said spacing force received by said spacing force receiving portion.146. An process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said process cartridge comprising: a photosensitive member; a photosensitive member frame rotatably supporting said photosensitive member; a developing roller for developing a latent image formed on said photosensitive member; a developing device frame rotatably supporting said developing roller and connected with said photosensitive member frame so as to be rotatable between a contacting position in which said developing roller is contacted with said photosensitive member and a spacing position in which said developing roller is spaced from said photosensitive member; a first drive transmission member rotatable about a rotation axis about is which said developing device frame is rotatable relative to said photosensitive member frame and capable of receiving a rotational force from the main assembly; a second drive transmission member rotatable about the rotation axis and capable of connecting with said first drive transmission member and tnmsmitting the rotational force to said developing roller; and a disconnecting mechanism for disconnecting between said first drive transmission member and said second drive transmission member in accordance with rotation of the developing device frame from the contacting position to said spacing position.147. A process cartridge according to Claim 146, wherein said disconnecting mechanism disconnects between said first drive transmission member and said second drive transmission member by moving said second drive transmission member along the rotation axis in accordance with rotation of said developing device frame from the contacting position to the spacing position.148. A process cartridge according to Claim 146or 147, wherein said disconnecting mechanism includes a guide portion for moving said second drive transmission member along the rotation axis.149. A process cartridge according to Claim 148, wherein said guide portion is provided on said developing device frame.150. A process cartridge according to any one of Claims 146 -149, wherein said disconnecting mechanism includes a coupling disconnection member movable in parallel with the rotation axis, and said coupling disconnection member urges is said second drive transmission member to separate from the first drive transmission member with the rotation of said developing device frame from the contacting position to the spacing position.151, A process cartridge according to Claim 150, wherein said disconnecting mechanism includes another guide portion for moving said coupling disconnection member along the rotation axis.152. A process cartridge according to Claim 151, wherein said other guide portion is provided on said developing device frame.153. A process cartridge accordingto Claim 151, wherein said otherguide portion is provided on said photosensitive member frame.134. A process cartridge according to any one of Claims 146-153, wherein said disconnecting mechanism includes an urging member for urging said coupling disconnection member in accordance with the rotation of said developing device frame from the contacting position to the spacing position.155. A process cartridge according to Claim 154, wherein said urging member is movably provided on said developing device frame, and is movable relative to said developing device frame by receiving a force from said photosensitive member frame in accordance with the rotation of said developing device frame from the contacting position to the spacing position.156. A process cartridge according to Claim t55, wherein said urging member is rotatable relative to said developing device frame about the rotation axis.157. A process cartridge according to Claim t54, wherein said urging member is provided on said photosensitive member frame.158. A process cartridge according to Claim 157, wherein said urging member is fixed to said photosensitive member frame.159. An electrophotographic image forming apparatus for forming an image on a recording material, said electrophotographic image forming apparatus comprising: (i) a main assembly including a main assembly drive transmission member for transmitting a rotational force; and (ii) a process cartridge detachably mountable to said main assembly, said process cartridge including, (ii -i) a photosensitive member, (ii -ii) a photosensitive member frame for rotatably supporting said photosensitive member, (ii -iii) a developing roller, (ii -iv) a developing device frame rotatably supporting said developing roller and connected with said photosensitive member frame so as to be rotatable between a contacting position in which said developing roller is contacted with said photosensitive member and a spacing position in which said developing roller is spaced from said photosensitive member, (ii -v) a first drive tnmsmission member rotatable about a rotation axis about which said developing device frame is rotatable relative to said photosensitive member frame aM capable of receiving a rotational force from the main assembly drive transmission member, is (ii -vi) a second drive transmission member rotatable about the rotation axis and capable of connecting with said first drive transmission member and transmitting the rotational force to said developing roller, and (ii -vii) a disconnecting mechanism for disconnecting between said first drive transmission member and said second drive transmission member in accordance with rotation of the developing device frame from the contacting position to said spacing position.